Longitudinal associations between family identification, loneliness, depression, and sleep quality.

This is the first Social Cure study to explore the mediated relationship between social identification and sleep quality. As well as advancing the Social Cure perspective, these results have implications for how health professionals understand, prevent, and treat sleep problems. Statement of contribution What is already known on this subject? The prevalence of depression and loneliness is increasing in Western nations, and both have been shown to cause poor sleep quality. Weak social networks have been shown to predict restless sleep over time, and that depressed mood mediates this relationship. What does this study add? Family identification negatively predicted poor sleep quality cross-sectionally. Depression and loneliness positively predicted poor sleep quality over time. Depression and loneliness mediated the family identification-sleep quality relationship over time.