Sleep restriction reduces positive social emotions and desire to connect with others.

Feeling connected with others and experiencing positive interpersonal interactions is associated with physical health and psychological functioning. Despite the importance of social experiences, experimental studies investigating how sleep impacts social connections and positive social experiences are limited. The current study sought to examine how sleep loss impacted social motivation and emotions. Healthy emerging adults (N = 53; 83% female, ages 18-28 years) were randomly assigned to one night of sleep restriction (4h time in bed) or typical sleep (8 h time in bed). Following the experimental night, participants reported on their desire to pursue social connections, and completed a reflection task where they wrote about something generous someone did for them. After the reflection, participants reported on their positive and negative social emotions (gratitude, connectedness, guilt, indebtedness). Coding of the reflections was conducted to extract emotional tone and social words used. Sleep restricted participants reported reduced motivation to pursue social connections, and less gratitude and feelings of connectedness after the reflection compared to the control condition. Sleep restricted participants also used fewer socially-oriented words (i.e. words focused on other people) when reflecting on this interpersonal event. No differences emerged in guilt or indebtedness or emotional tone of the reflection. Findings suggest that sleep loss may decrease desire to engage in social interactions and reduces positive social emotions. These findings expand the limited body of research on sleep and social functioning by examining the impact of partial sleep restriction on social motivation, and on the experience of social emotions within a positive interpersonal context.

Daily Associations Between Adolescent Sleep and Socioemotional Experiences During an Ongoing Stressor.

PURPOSE: Ongoing stress can result in sleep disturbances and daytime socioemotional difficulties. Data on how sleep and daytime socioemotional functioning may be bidirectionally related to one another in the midst of an ongoing stressor are limited, particularly during adolescence, a developmental period when risk for the onset of mental health difficulties and sleep disturbances is high. METHODS: Participants (N = 459, ages of 13-18 years) were recruited from across the United States and completed an intake survey and one week of daily reports beginning 2 weeks after COVID-19 was declared a national emergency. Participants reported on their daily post-traumatic stress symptoms, positive and negative affect, loneliness, sleep onset difficulties, nightmares, sleep quality, and time in bed. RESULTS: Lagged hierarchical linear models adjusting for age, sex, socioeconomic status, race, ethnicity, medication use, medical conditions, and ongoing stressors were estimated to examine bidirectional associations between night-time sleep and next-day mental health. Poorer sleep quality and more nightmares at night predicted higher next-day negative affect, and greater daytime negative affect predicted lower sleep quality and a greater likelihood of having nightmares the following night. Poor sleep quality predicted greater next-day post-traumatic stress, which, in turn, predicted poorer sleep quality the following night and more difficulties falling asleep. Poor sleep quality and a longer time in bed also predicted greater next-day loneliness. DISCUSSION: Overall, these findings provide insight into how sleep disturbances and socioemotional difficulties unfold during a major life stressor in an adolescent sample.