Lemola S Ledermann T Friedman EM 2013 While there is a large body of evidence that poor subjective sleep quality is related to lower subjective well-being, studies on the relation of objective sleep measures and subjective well-being are fewer in number and less consistent in their findings. Using data of the Survey of Mid-Life in the United States (MIDUS), we investigated whether duration and quality of sleep, assessed by actigraphy, were related to subjective well-being and whether this relationship was mediated by subjective sleep quality. Three hundred and thirteen mainly white American individuals from the general population and 128 urban-dwelling African American individuals between 35 and 85 years of age were studied cross-sectionally. Sleep duration, variability of sleep duration, sleep onset latency, and time awake after sleep onset were assessed by actigraphy over a period of 7 days. Subjective sleep quality was assessed with the Pittsburgh Sleep Quality Index, positive psychological well-being and symptoms of psychological distress were assessed with the Satisfaction with Life Scale and the Mood and Anxiety Symptom Questionnaire. In both white and African Americans high day-to-day variability in sleep duration was related to lower levels of subjective well-being controlling age, gender, educational and marital status, and BMI. By contrast, sleep duration, sleep onset latency, and time awake after sleep onset were not related to subjective well-being controlling covariates and other sleep variables. Moreover, the relationship between variability in sleep duration and well-being was partially mediated by subjective sleep quality. The findings show that great day-to-day variability in sleep duration--more than average sleep duration--is related to poor subjective sleep quality and poor subjective well-being. application/pdf https://sonar.ch/global/documents/149891 eng info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0071292 info:eu-repo/semantics/altIdentifier/pmid/23967186 info:eu-repo/semantics/openAccess PloS one. - 2013 Actigraphy Adult African Americans Aged Aged, 80 and over Cross-Sectional Studies Female Humans Male Middle Aged Personal Satisfaction Regression Analysis Self Report Sleep Surveys and Questionnaires Time Factors Variability of sleep duration is related to subjective sleep quality and subjective well-being: an actigraphy study. http://purl.org/coar/resource_type/c_6501