Sleep and self-control: A systematic review and meta-analysis.

Controlling impulses and overcoming temptations (i.e., self-control) are key aspects of living a productive life. There is a growing yet disperse literature indicating that sleep is an important predictor of self-control. The goal of this meta-analysis is to empirically integrate the findings from multiple literatures, and investigate whether sleep quality, and sleep duration predict self-control. To provide a thorough understanding of the proposed relationships, this meta-analysis also investigated potential differences between the level of analysis (between-individual vs. within-individual), research design (experiment vs. correlation; and cross-sectional vs. time-lagged), and types of measure (subjective vs. objective for sleep and self-control). A systematic review was conducted through ABI/Inform (including PsycInfo), ERIC, ProQuest Dissertation & Theses, PubMed, and Psychology Database using keywords related to self-control and sleep. Sixty-one independent studies met the inclusion criteria. The results, in general, suggest that sleep quality (between-individual 0.26, CI 0.21; 0.31; and within-individual 0.35, CI 0.24; 0.45), and sleep duration (between-individual 0.14, CI 0.07; 0.21; and within-individual 0.20, CI 0.09; 0.31) are all related to self-control. Given the impact of self-control on how individuals live productive lives, a future research agenda should include a deeper investigation in the causal process (potentially via prefrontal cortex activity) linking sleep and self-control, and an examination of the moderators (individual and contextual variables) that could impact the relationship between sleep and self-control.

The effects of blue-light filtration on sleep and work outcomes.

In this article, we investigate the effects of blue-light filtration on broad attitudinal and behavioral outcomes (i.e. work engagement, organizational citizenship behavior, and counterproductive work behavior). Drawing on recent developments in the circadian process literature and its related research on chronobiology, we propose that a cost-effective sleep intervention can improve multiple organizationally relevant outcomes. Specifically, we theorize that wearing blue-light filtering glasses creates a form of physiologic darkness, thus improving both sleep quantity and quality. We then argue that wearing blue-light filtering glasses is related to work engagement, task performance, and nontask performance via sleep quantity and sleep quality. Considering that individuals vary in the timing of their circadian process, we propose that chronotype is a first-stage moderator for our theoretical model. We tested these theoretical expectations in 2 experimental experience sampling studies. In Study 1a, we collected data from 63 managers (519 daily observations) and found that wearing blue-light filtering glasses is an effective intervention to improve physiological (sleep), attitudinal (work engagement), and behavioral (task performance, organizational citizenship behavior, and counterproductive work behavior) outcomes. In general, the effects were stronger for employees who tend to have sleep periods later in the day. In Study 1b, we collected data from 67 call center representatives (529 daily observations) and measured task performance from clients. We replicated most of the findings except for the interactions. Our model highlights how and when wearing blue-light filtering glasses can help employees to live and work better. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Too tired to inspire or be inspired: Sleep deprivation and charismatic leadership.

We draw from theory on sleep and affect regulation to extend the emotional labor model of leadership. We examine both leader and follower sleep as important antecedents of attributions of charismatic leadership. In Study 1, we manipulate the sleep of leaders, and find that leader emotional labor in the form of deep acting (but not surface acting or authentically experienced positive affect) mediates the harmful effect of leader sleep deprivation on follower ratings of charismatic leadership. In Study 2, we manipulate the sleep of followers, and find that follower experienced positive affect mediates the harmful effect of follower sleep deprivation on follower ratings of charismatic leadership of the leader. Thus, both leader and follower sleep deprivation harm attributions of charismatic leadership, with the regulation and experience of affect as causal mechanisms. (PsycINFO Database Record

Identified ambivalence: When cognitive conflicts can help individuals overcome cognitive traps.

In this article we investigate the functional effects of ambivalence on decision-making processes. We build on the misattribution literature and recent work on ambivalence to propose that individuals who properly identify the causes of their ambivalence (i.e., identified ambivalence) can systematically process relevant situational cues to make more effective decisions. The results of 4 studies demonstrate that individuals experiencing identified ambivalence are less influenced by cognitive biases (i.e., the framing effect, availability bias, and conjunction bias) than individuals experiencing no ambivalence or felt ambivalence. Notably, we find that contextual awareness accounts for the effect of identified ambivalence on decision effectiveness. We then investigate the role of trait self-control as a specific contingency in our model; our results indicate that identified ambivalence leads to effective decisions when individuals are low in trait self-control. Taken together, we advance theory and offer robust, consistent empirical evidence that explains why and how ambivalence can result in functional outcomes. (PsycINFO Database Record