Multidimensionality of the PROMIS sleep disturbance 8b short form in working adult populations.

OBJECTIVES: The Patient-Reported Outcomes Measurement Information System sleep disturbance measures were developed using item response theory assumptions of unidimensionality and local independence. Given that sleep health is multidimensional, we evaluate the factor structure of the Patient-Reported Outcomes Measurement Information System sleep disturbance 8b short form to examine whether it reflects a unidimensional or multidimensional construct. METHODS: Six full-time working adult samples were collected from civilian and military populations. Exploratory and confirmatory factor analyses were conducted. Single-factor and two-factor models were performed to evaluate the dimensionality of sleep disturbance using the 8b short form. Sleep duration and subjective health were examined as correlates of the sleep disturbance dimensions. RESULTS: Across six working adult samples, single-factor models consistently demonstrated poor fit, whereas the two-factor models, with insomnia symptoms (ie, trouble sleeping) and dissatisfaction with sleep (ie, subjective quality of sleep) dimensions demonstrated sufficient fit that was significantly better than the single-factor models. Across each sample, dissatisfaction with sleep was more strongly correlated with sleep duration and subjective health than insomnia symptoms, providing additional evidence for distinguishability between the two sleep disturbance factors. CONCLUSIONS: In working adult populations, the Patient-Reported Outcomes Measurement Information System sleep disturbance 8b short form is best modeled as two distinguishable factors capturing insomnia symptoms and dissatisfaction with sleep, rather than as a unidimensional sleep disturbance construct.

The effects of a Total Worker Health intervention on workplace safety: Mediating effects of sleep and supervisor support for sleep.

We tested the effects of a randomized controlled trial Total Worker Health intervention on workplace safety outcomes. The intervention targeted employee sleep at both the supervisor-level (e.g., sleep-specific support training) and employee-level (e.g., sleep tracking and individualized sleep feedback). The intervention components were developed using principles of the Total Worker Health approach and the theory of triadic influence for health behaviors. We hypothesized that employees in the treatment group would report greater safety compliance, safety participation, and safety motivation, and would be less likely to experience a work-related accident or injury following the intervention through improvements in sleep quantity and quality, as well as increased perceptions of supervisors' support for sleep. It was theorized that the indirect effects of the intervention on workplace safety outcomes via sleep mediators operated through a resource pathway, whereas the supervisor support for sleep mediator operated through an exchange pathway. Results broadly revealed that employees in the treatment group, compared to those in the control group, reported greater workplace safety behaviors and safety motivation, and reduced workplace accidents and injuries 9 months post-baseline, through lower dissatisfaction with sleep, reduced sleep-related impairments, and greater supervisor support for sleep 4 months post-baseline. Intervening on sleep and supervisor support for sleep in an integrated Total Worker Health framework can have a positive impact on workplace safety. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Engaging with nature and work: associations among the built and natural environment, experiences outside, and job engagement and creativity.

Introduction: There is substantial evidence that contact with nature is related to positive health and well-being outcomes, but extensions of this research to work-related outcomes is sparse. Some organizations are redesigning workspaces to incorporate nature and adopting nature-related policies, warranting a need for empirical studies that test the influence of nature on employee outcomes. Methods: The present mixed-methods study tests and extends the biophilic work design model to examine associations among the built and natural environment at work and home, experiences of time spent outside (i.e., amount of time outside, enjoyment of time outside, outdoor activities), and motivational work outcomes (i.e., job engagement and creativity). Objective geographic data were combined with quantitative and qualitative survey responses from working adults (N = 803). Results: Our results broadly indicate that individuals who work and live in areas with greater natural amenities (i.e., access to water, topographic variation, temperate climates) spend more time outside and enjoy time outside to a greater degree, and these experiences are in turn associated with greater engagement and creativity at work. We did not find evidence that the surrounding built environment (i.e., urbanity) at work or home was associated with outdoor experiences or work-related outcomes. Additionally, six categories of outdoor activities were identified in the qualitative analyses - leisure activities, relaxation, physical activities, social interactions, tasks and errands, and travel. Discussion: The findings from this study provide evidence that the natural environment, particularly at home, can benefit work-related outcomes via greater time and enjoyment of time outside. This study has implications for employee time use and organizational effectiveness.

Inadequate sleep moderates effects of interparental conflict appraisals on adolescent adjustment.

OBJECTIVES: Previous research and theory suggest that interparental conflict that is perceived by youth as frequent/intense, threatening, and/or the responsibility of the youth is predictive of adjustment problems. In contrast, sleep, an important precursor to emotion regulation, is likely a protective factor for youth experiencing interparental conflict. The goal of the current study was to investigate the extent to which adolescents who maintain better and/or longer sleep are buffered from the adjustment problems associated with greater interparental conflict. METHODS: One-hundred and fifty adolescents completed questionnaires assessing interparental conflict (frequency/intensity perceptions as well as threat and self-blame appraisals) as well as internalizing and externalizing behaviors. Participants also wore an actigraph over 1 week to objectively measure sleep quantity and quality; 123 participants had valid actigraphy data. RESULTS: Results of structural equation modeling analyses revealed that greater sleep quality weakened the association between interparental conflict and adjustment problems, particularly internalizing behaviors. However, sleep quantity was not a moderator. CONCLUSION: These results suggest that higher quality sleep may protect adolescents from the negative effects of interparental conflict.

Within-Person variations in mindfulness mediate effects of daily stressors on psychological distress in adolescence.

OBJECTIVE: We tested two competing models linking daily stress, mindfulness, and psychological distress in adolescence: 1) whether daily mindfulness moderates the impact of daily stressors on psychological distress or 2) whether mindfulness mediates the relationship between greater daily stressors and psychological distress. METHODS: Every evening for a week, 138 adolescents completed ecological momentary assessments (EMAs). Daily diaries assessed negative events, work-school conflict, mindfulness, and perceived stress. Multilevel mediation and moderation were tested. RESULTS: Results indicated that there were meaningful variations in adolescent mindfulness from day-to-day, and supported mediation rather than moderation; the within-person association between stressors and psychological distress was mediated by mindfulness at the daily level. CONCLUSION: It may be too challenging for adolescents to remain in a mindful state during stress to effectively use mindfulness as a buffer. Instead, daily stressors may indirectly impact psychological distress through decreasing mindfulness.

Testing Bidirectional Within-Person Associations between Mindful Attention and Sleep in Adolescence.

Developments during adolescence increase risk for sleep problems. Research in adults suggests mindfulness and sleep are associated, with two different theoretical explanations for direction of effects. Our goal was to directly test these competing theoretical models at the daily level in adolescents using objective and self-reported measurements of sleep. Adolescents (N=138; 14-21yrs) reported mindful attention and sleep for a week, while wearing an actigraph. Results indicated that, within-person, poor sleep at night predicted less mindful attention the next day; however, mindful attention during the day did not predict sleep that night. These findings provide support for the developmental model of sleep and regulation and suggest poor sleep may impair regulatory abilities the following day.

Measuring sleep duration in adolescence: Comparing subjective and objective daily methods.

OBJECTIVES: This study provides the first investigation into the correspondence between self-reported and actigraph-measured nighttime sleep duration in adolescents that disambiguates between- versus within-person associations. Moderators were evaluated to determine if between- and within-person correspondence vary by participant characteristics. METHODS: One hundred fifty adolescents (14-21 years) reported sleep time for 1 week, while wearing an actigraph, and reported on moderators, including demographics (i.e., sex, age, ethnicity, and socioeconomic status), depressive symptoms, and perceived stress. Mixed effects models evaluated within- and between-person associations between self-reported and actigraph-measured sleep, and examined whether these associations differed by possible moderators. RESULTS: Results indicated significant between- (b = 0.77, SE = 0.08, P < .001) and within-person (b = 0.51, SE = 0.04, P < .001) associations between self-reported and actigraph-measured sleep duration, with no significant moderation effects. CONCLUSIONS: Our results support the use of either self-reports or actigraphs to examine within-person nighttime sleep duration in adolescent community samples.

Effects of a Total Worker Health® leadership intervention on employee well-being and functional impairment.

Although evidence has been mounting that supervisor support training interventions promote employee job, health, and well-being outcomes, there is little understanding of the mechanisms by which such interventions operate (e.g., Hammer et al., 2022; Inceoglu et al., 2018), nor about the integration of such organizational-level interventions with individual-level interventions (e.g., Lamontagne et al., 2007). Thus, the present study attempts to unpack the mechanisms through which supervisor support training interventions operate. In addition, the present study examines an integrated Total Worker Health® intervention that combines health protection in the form of supervisor support training (i.e., family supportive supervisor behaviors and supervisor support for sleep health) with a health promotion approach in the form of feedback to improve sleep health behaviors. Using a cluster randomized controlled trial drawing on a sample of 704 full-time employees, results demonstrate that the Total Worker Health intervention improves employee job well-being (i.e., increased job satisfaction and reduced turnover intentions), personal well-being (i.e., reduced stress before bedtime), and reduces personal and social functional impairment at 9 months postbaseline through employee reports of supervisors' support for sleep at 4 months postbaseline, but not through family supportive supervisor behaviors. Effects were not found for general stress or occupational functional impairment outcomes. Implications are discussed, including theoretical mechanisms by which leadership interventions affect employees, supervisor training, as well as the role of integrated organizational and individual-level interventions. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Fighting fatigue: A conceptual model of driver sleep in the gig economy.

The purpose of this paper was to integrate the sleep science, occupational health, and organizational psychology literature to develop a conceptual model of driver sleep and fatigue in the gig economy. We develop an integrative framework, which proposes that aspects of the on-demand driving context influence driver sleep health and fatigue. Driver outcomes include safety incidents, injuries, health, job attitudes, interpersonal behavior, and performance. In addition, moderators, such as driver demographics and health conditions, can interact with aspects of the driver context. A number of practical implications are provided, addressing the ways in which occupational health researchers, online labor platform companies, and drivers can improve sleep health. This is the first paper to provide a broad understanding of how scientists, through both research and practice, can help improve sleep, a primary issue in the ridesharing industry.

Associations among patient care workers' schedule control, sleep, job satisfaction and turnover intentions.

Healthcare is the fastest growing occupational sector in America, yet patient care workers experience low job satisfaction, high turnover, and susceptibility to poor sleep compared to workers in other jobs and industries. Increasing schedule control may be one way to help mitigate these issues. Drawing from conservation of resources theory, we evaluate associations among schedule control (i.e. a contextual resource), employee sleep duration and quality (i.e. personal resources), job satisfaction, and turnover intentions. Patient care workers who reported having more schedule control at baseline reported greater sleep duration and sleep quality 6 months later, as well as higher job satisfaction and lower turnover intentions 12 months later. Workers who experienced greater sleep sufficiency (i.e. feeling well-rested) reported higher job satisfaction 6 months later, and workers who experienced fewer insomnia symptoms (i.e. trouble falling and staying asleep) reported lower turnover intentions 6 months later. The association between schedule control and job satisfaction was partially mediated by greater sleep sufficiency, though this effect was small. Providing patient care workers with greater control over their work schedules and opportunities for improved sleep may improve their job attitudes. Results were not replicated when different analytical approaches were performed, so findings should be interpreted provisionally.

The relationship between leadership support and employee sleep.

Sleep is critical to employees' health and well-being, safety, and performance at work. Sleep leadership refers to supervisor behaviors that aim to improve employees' sleep, such as showing concern for the quantity and quality of employees' sleep. Using a sample of 180 employees and their 91 supervisors working as full-time National Guard military service members, we examined the relationship of sleep leadership and family-supportive supervisor behaviors (FSSB) to employees' sleep. As outcomes we measured objective sleep quality and quantity using validated wrist actigraphy methods, as well as self-reported sleep hygiene, subjective sleep quantity, and subjective sleep quality (sleep disturbance and sleep-related impairment). As a novel contribution to the literature, we included both supervisors' self-reports and employees' reports of supervisors' engagement in sleep leadership and FSSB. Contradicting our hypotheses, our results show that higher employee ratings of FSSB were related to shorter objective sleep time. Regarding self-reported sleep outcomes, higher employees' ratings of sleep leadership were associated with less sleep disturbance and less sleep-related impairment among employees. Higher supervisors' self-ratings of FSSB, in turn, were related to better sleep hygiene and less sleep-related impairment among employees. Overall, our study demonstrates the importance of supportive supervisor behaviors for employees' sleep quality. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Moral Injury, Substance Use, and Posttraumatic Stress Disorder Symptoms Among Military Personnel: An Examination of Trait Mindfulness as a Moderator.

Mindfulness-based approaches have been suggested as possible methods to treat moral injury in military personnel. However, empirical research has yet to evaluate if mindfulness acts as a protective factor for the possible negative effects of moral injury, such as alcohol use, drug use, or posttraumatic stress disorder (PTSD) symptoms. In this study, we investigated if five facets of mindfulness (i.e., observing, nonjudging, nonreactivity, awareness, and describing) moderated associations between moral injury and the outcomes of PTSD symptoms, alcohol misuse, and drug abuse symptoms in a sample of military personnel. Participants were 244 military personnel (the majority were former military members) who had been deployed at least once during the Iraq War, War in Afghanistan, other wars, or humanitarian missions. The study results indicated that nonjudging, ß = -.22, and awareness, ß = -.25, had significant attenuating effects on the association between moral injury and drug abuse symptoms. However, observing, ß = .17; nonreactivity, ß = .23; and describing, ß = .15, had significant synergistic effects (i.e., they strengthened the association between moral injury and drug abuse symptoms). There were no significant moderation effects on the associations between moral injury and PTSD symptoms or between moral injury and alcohol misuse. Our results provide initial evidence that not all facets of mindfulness may protect against the challenges of coping with moral injury. Directions for future research and implications for practice are discussed.

Spanish Abstracts by Asociación Chilena de Estrés Traumático (ACET) Daño moral, uso de sustancias y síntomas de TEPT entre el personal militar: un examen de la atención consciente de los rasgos como moderador MINDFULNESS Y DAÑO MORAL EN VETERANOS Se han sugerido enfoques basados ​​en la atención plena (o mindfulness en inglés) como posibles métodos para tratar el daño moral en el personal militar. Sin embargo, la investigación empírica aún debe evaluar si la atención plena actúa como un factor protector para los posibles efectos negativos del daño moral, como el consumo de alcohol, el uso de drogas o los síntomas del trastorno de estrés postraumático (TEPT). En este estudio, investigamos si cinco facetas de la atención plena (es decir, observar, no juzgar, no reaccionar, conciencia y describir) moderaron las asociaciones entre daño moral y los resultados de los síntomas del TEPT, el uso indebido del alcohol y los síntomas del abuso de drogas en una muestra de personal militar. Los participantes eran 244 militares (la mayoría de ellos ex militares) que habían sido desplegados al menos una vez durante la Guerra de Irak, la Guerra en Afganistán, otras guerras o misiones humanitarias. Los resultados del estudio indicaron que el no juzgar, ß = −.22, y la conciencia ß = −.25, tuvieron efectos atenuantes significativos en la asociación entre daño moral y síntomas de abuso de drogas. Sin embargo, observar, ß = .17; no reactividad, ß = .23; y describir, ß = .15, tuvo efectos sinérgicos significativos (es decir, fortalecieron la asociación entre daño moral y los síntomas de abuso de drogas). No hubo efectos significativos de moderación en las asociaciones entre el daño moral y los síntomas del TEPT o entre el daño moral y el abuso del alcohol. Nuestros resultados proporcionan evidencia inicial de que no todas las facetas de la atención plena pueden proteger contra los desafíos de enfrentar el daño moral. Se discuten lineamientos para futuras investigaciones y las implicaciones para la práctica.

Sustaining sleep: Results from the randomized controlled work, family, and health study.

Although calls for intervention designs are numerous within the organizational literature and increasing efforts are being made to conduct rigorous randomized controlled trials, existing studies have rarely evaluated the long-term sustainability of workplace health intervention outcomes, or mechanisms of this process. This is especially the case with regard to objective and subjective sleep outcomes. We hypothesized that a work-family intervention would increase both self-reported and objective actigraphic measures of sleep quantity and sleep quality at 6 and 18 months post-baseline in a sample of information technology workers from a U.S. Fortune 500 company. Significant intervention effects were found on objective actigraphic total sleep time and self-reported sleep insufficiency at the 6- and 18-month follow-up, with no significant decay occurring over time. However, no significant intervention effects were found for objective actigraphic wake after sleep onset or self-reported insomnia symptoms. A significant indirect effect was found for the effect of the intervention on objective actigraphic total sleep time through the proximal intervention target of 6-month control over work schedule and subsequent more distal 12-month family time adequacy. These results highlight the value of long-term occupational health intervention research, while also highlighting the utility of this work-family intervention with respect to some aspects of sleep. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

The effects of sleep on workplace cognitive failure and safety.

Healthy employee sleep is important for occupational safety, but the mechanisms that explain the relationships among sleep and safety-related behaviors remain unknown. We draw from Crain, Brossoit, and Fisher's (in press) work, nonwork, and sleep (WNS) framework and Barnes' (2012) model of sleep and self-regulation in organizations to investigate the influence of construction workers' self-reported sleep quantity (i.e., duration) and quality (i.e., feeling well-rest upon awakening, ability to fall asleep and remain asleep) on workplace cognitive failures (i.e., lapses in attention, memory, and action at work) and subsequent workplace safety behaviors (i.e., safety compliance and safety participation) and reports of minor injuries. Construction workers from two public works agencies completed surveys at baseline, 6 months, and 12 months. Our results suggest that workers with more insomnia symptoms on average reported engaging in fewer required and voluntary safety behaviors and were at a greater risk for workplace injuries. These effects were mediated by workplace cognitive failures. In addition, workers with greater sleep insufficiency on average reported lower safety compliance, but this effect was not mediated by workplace cognitive failures. These results have implications for future workplace interventions, suggesting that organizations striving to improve safety should prioritize interventions that will reduce workers' insomnia symptoms and improve their ability to quickly fall asleep and stay asleep throughout the night. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

Bidirectional, Temporal Associations of Sleep with Positive Events, Affect, and Stressors in Daily Life Across a Week.

BACKGROUND: Sleep is intricately tied to emotional well-being, yet little is known about the reciprocal links between sleep and psychosocial experiences in the context of daily life. PURPOSE: The aim of this study is to evaluate daily psychosocial experiences (positive and negative affect, positive events, and stressors) as predictors of same-night sleep quality and duration, in addition to the reversed associations of nightly sleep predicting next-day experiences. METHODS: Daily experiences and self-reported sleep were assessed via telephone interviews for eight consecutive evenings in two replicate samples of US employees (131 higher-income professionals and 181 lower-income hourly workers). Multilevel models evaluated within-person associations of daily experiences with sleep quality and duration. Analyses controlled for demographics, insomnia symptoms, the previous day's experiences and sleep measures, and additional day-level covariates. RESULTS: Daily positive experiences were associated with improved as well as disrupted subsequent sleep. Specifically, positive events at home predicted better sleep quality in both samples, whereas greater positive affect was associated with shorter sleep duration among the higher-income professionals. Negative affect and stressors were unrelated to subsequent sleep. Results for the reversed direction revealed that better sleep quality (and, to a lesser degree, longer sleep duration) predicted emotional well-being and lower odds of encountering stressors on the following day. CONCLUSIONS: Given the reciprocal relationships between sleep and daily experiences, efforts to improve well-being in daily life should reflect the importance of sleep.

Daily antecedents and consequences of nightly sleep.

Sleep can serve as both cause and consequence of individuals' everyday experiences. We built upon prior studies of the correlates of sleep, which have relied primarily on cross-sectional data, to examine the antecedents and consequences of sleep using a daily diary design. Specifically, we assessed the temporal sequence between nightly sleep and daily psychosocial stressors. Parents employed in a US information technology company (n = 102) completed eight consecutive daily diaries at both baseline and 1 year later. In telephone interviews each evening, participants reported on the previous night's sleep hours, sleep quality and sleep latency. They also reported daily work-to-family conflict and time inadequacy (i.e. perceptions of not having enough time) for their child and for themselves to engage in exercise. Multi-level models testing lagged and non-lagged effects simultaneously revealed that sleep hours and sleep quality were associated with next-day consequences of work-to-family conflict and time inadequacy, whereas psychosocial stressors as antecedents did not predict sleep hours or quality that night. For sleep latency, the opposite temporal order emerged: on days with more work-to-family conflict or time inadequacy for child and self than usual, participants reported longer sleep latencies than usual. An exception to this otherwise consistent pattern was that time inadequacy for child also preceded shorter sleep hours and poorer sleep quality that night. The results highlight the utility of a daily diary design for capturing the temporal sequences linking sleep and psychosocial stressors.

Cultivating teacher mindfulness: Effects of a randomized controlled trial on work, home, and sleep outcomes.

The effects of randomization to a workplace mindfulness training (WMT) or a waitlist control condition on teachers' well-being (moods and satisfaction at work and home), quantity of sleep, quality of sleep, and sleepiness during the day were examined in 2 randomized, waitlist controlled trials (RCTs). The combined sample of the 2 RCTs, conducted in Canada and the United States, included 113 elementary and secondary school teachers (89% female). Measures were collected at baseline, postprogram, and 3-month follow-up; teachers were randomly assigned to condition after baseline assessment. Results showed that teachers randomized to WMT reported less frequent bad moods at work and home, greater satisfaction at work and home, more sleep on weekday nights, better quality sleep, and decreased insomnia symptoms and daytime sleepiness. Training-related group differences in mindfulness and rumination on work at home at postprogram partially mediated the reductions in negative moods at home and increases in sleep quality at follow-up. (PsycINFO Database Record

The influence of family-supportive supervisor training on employee job performance and attitudes: An organizational work-family intervention.

Training supervisors to increase their family-supportive supervisor behaviors (FSSB) has demonstrated significant benefits for employee physical health, job satisfaction, and turnover intentions among employees with high levels of family-to-work conflict in prior research in a grocery store context. We replicate and extend these results in a health care setting with additional important employee outcomes (i.e., employee engagement, organizational commitment, and supervisor ratings of job performance), and consider the role of the 4 dimensions underlying the FSSB. Using a quasi-experimental, pretest-posttest design, 143 health care employees completed surveys at 2 time periods approximately 10 months apart, along with their supervisors who provided ratings of employees' job performance. Between these surveys, we offered their supervisors FSSB training; 86 (71%) of these supervisors participated. Results demonstrated significant and beneficial indirect effects of FSSB training on changes in employee job performance, organizational commitment, engagement, job satisfaction, and turnover intentions through changes in employee perceptions of their supervisor's overall FSSBs. Further analyses suggest that these indirect effects are due primarily to changes in the creative work-family management dimension of FSSB. (PsycINFO Database Record

Intervention effects on safety compliance and citizenship behaviors: Evidence from the Work, Family, and Health Study.

We tested the effects of a work-family intervention on employee reports of safety compliance and organizational citizenship behaviors in 30 health care facilities using a group-randomized trial. Based on conservation of resources theory and the work-home resources model, we hypothesized that implementing a work-family intervention aimed at increasing contextual resources via supervisor support for work and family, and employee control over work time, would lead to improved personal resources and increased employee performance on the job in the form of self-reported safety compliance and organizational citizenship behaviors. Multilevel analyses used survey data from 1,524 employees at baseline and at 6-month and 12-month postintervention follow-ups. Significant intervention effects were observed for safety compliance at the 6-month, and organizational citizenship behaviors at the 12-month, follow-ups. More specifically, results demonstrate that the intervention protected against declines in employee self-reported safety compliance and organizational citizenship behaviors compared with employees in the control facilities. The hypothesized mediators of perceptions of family-supportive supervisor behaviors, control over work time, and work-family conflict (work-to-family conflict, family-to-work conflict) were not significantly improved by the intervention. However, baseline perceptions of family-supportive supervisor behaviors, control over work time, and work-family climate were significant moderators of the intervention effect on the self-reported safety compliance and organizational citizenship behavior outcomes.

A workplace intervention improves sleep: results from the randomized controlled Work, Family, and Health Study.

STUDY OBJECTIVES: The Work, Family, and Health Network Study tested the hypothesis that a workplace intervention designed to increase family-supportive supervision and employee control over work time improves actigraphic measures of sleep quantity and quality. DESIGN: Cluster-randomized trial. SETTING: A global information technology firm. PARTICIPANTS: US employees at an information technology firm. INTERVENTIONS: Randomly selected clusters of managers and employees participated in a 3-month, social, and organizational change process intended to reduce work-family conflict. The intervention included interactive sessions with facilitated discussions, role playing, and games. Managers completed training in family-supportive supervision. MEASUREMENTS AND RESULTS: Primary outcomes of total sleep time (sleep duration) and wake after sleep onset (sleep quality) were collected from week-long actigraphy recordings at baseline and 12 months. Secondary outcomes included self-reported sleep insufficiency and insomnia symptoms. Twelve-month interviews were completed by 701 (93% retention), of whom 595 (85%) completed actigraphy. Restricting analyses to participants with e3 valid days of actigraphy yielded a sample of 473-474 for intervention effectiveness analyses. Actigraphy-measured sleep duration was 8 min/d greater among intervention employees relative to controls (P < .05). Sleep insufficiency was reduced among intervention employees (P = .002). Wake after sleep onset and insomnia symptoms were not different between groups. Path models indicated that increased control over work hours and subsequent reductions in work-family conflict mediated the improvement in sleep sufficiency. CONCLUSIONS: The workplace intervention did not overtly address sleep, yet intervention employees slept 8 min/d more and reported greater sleep sufficiency. Interventions should address environmental and psychosocial causes of sleep deficiency, including workplace factors.