Research Mentor Name

Dr. Hilary A. Marusak

Research Mentor Email Address

Institution / Department

Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine

Document Type

Research Abstract

Research Type


Level of Research



Sleep timing, particularly later midpoint of sleep, has been linked to emotion dysregulation and psychopathology. Prior adult studies link poor sleep (e.g., shorter duration, later midpoint), to altered resting-state functional connectivity (rs-FC) within and between key neurocognitive networks, particularly the default mode network (DMN), which is involved in internal thought and rumination. Importantly, many psychiatric disorders begin during adolescence, a period of shifted sleep schedules. We explored associations between midpoint of sleep and rs-FC of the DMN and other core neurocognitive networks in youth. Sleep timing was measured in 3,798 youth (11.9±0.6 years, 47.5% female) from the Adolescent Brain Cognitive Development study using Fitbit watches (over 13.1±6.5 days). Internalizing symptoms were measured using self-report and rs-FC was measured between the DMN and three neurocognitive networks: dorsal attention network (DAN), frontoparietal network (FPN), and salience network (SN). Associations between sleep timing and rs-FC were measured using linear regressions adjusting for age, sex, race, parental education, family income, puberty, and head motion. Average midpoint of sleep was 3:35 AM (range: 12:34 AM-11:27 PM). Later midpoint of sleep was associated with increased self-reported depressive symptoms. Later midpoint of sleep was associated with lower DMN-DAN rs-FC. There were no associations between midpoint of sleep and DMN-DMN, DMN-FPN, or DMN-SN network rs-FC. These results add to and extend prior studies in youth by incorporating objective measures of sleep timing (Fitbit data), and in a large national sample. Additionally, our findings may have implications for the consideration of sleep timing when designing behavioral-health interventions in youth.


Medicine and Health Sciences