title: Relationships among sleepiness, sleep time, and psychological functioning in adolescents.
abstract: OBJECTIVE
  This study examined associations among adolescent sleepiness, sleep duration, variability in sleep duration, and psychological functioning (symptoms of anxiety, depression, externalizing behaviors, and perceived health).
  
  
  METHODS
  This was a cross-sectional analysis of data from a community-based cohort study of sleep and health. Participants were 247 adolescents (48.6% female, 54.3% ethnic minority, mean age of 13.7 years). Sleep duration and variability in sleep duration were measured by actigraphy and sleepiness was measured by adolescent questionnaire. Primary outcomes were measured by parent, teacher, and adolescent questionnaires.
  
  
  RESULTS
  Sleepiness was associated with higher scores on measures of anxiety (Adjusted partial r(2) = .28, p < .001), depression (Adjusted partial r(2) = .23, p < .001), and perceived health (indicating more negative outcomes) (Adjusted partial r(2) = .19, p < .01). Significant associations between sleep duration or variability in sleep duration with psychological variables were not found.
  
  
  CONCLUSIONS
  Findings highlight the inter-relationships between sleepiness and psychological functioning and the potential importance of addressing sleepiness in health and psychological evaluations of adolescents.
authors.affiliation: Center for Sleep and Respiratory Neurobiology, University of Pennsylvania School of Medicine, USA. mooremel@email.chop.edu
authors.forename: Melisa
authors.initials: M
authors.lastname: Moore
authors.forename: H Lester
authors.initials: HL
authors.lastname: Kirchner
authors.forename: Dennis
authors.initials: D
authors.lastname: Drotar
authors.forename: Nathan
authors.initials: N
authors.lastname: Johnson
authors.forename: Carol
authors.initials: C
authors.lastname: Rosen
authors.forename: Sonia
authors.initials: S
authors.lastname: Ancoli-Israel
authors.forename: Susan
authors.initials: S
authors.lastname: Redline
mesh_terms: D000223:Adaptation, Psychological; D000293:Adolescent; D001008:Anxiety Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D001294:Attitude to Health; D015992:Body Mass Index; D002653:Child Behavior Disorders / Q000175:diagnosis / Q000523:psychology; D015331:Cohort Studies; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D006970:Disorders of Excessive Somnolence / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D005260:Female; D006801:Humans; D007389:Internal-External Control; D008297:Male; D012892:Sleep Deprivation / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D012917:Social Adjustment; D013223:Statistics as Topic