title: An investigation of the longitudinal relationship between sleep and depressed mood in developing teens.
abstract: OBJECTIVE
  The prospective, bidirectional relationship between sleep disturbance and depressed mood was assessed in a school-based sample of adolescents.
  
  
  METHODS
  One hundred and thirty-eight Australian adolescents (mean age time 1 =15.69, standard deviation =0.92; 64% male) completed questionnaires to assess sleep parameters and depressed mood, on two occasions over 1 year.
  
  
  RESULTS
  Cross-sectional associations were observed between depressed mood and sleep duration, as well as wakefulness in bed. Prospective analyses revealed depressed mood predicted less total sleep time on school nights and a longer latency to sleep onset on weekends 1 year later. There was no prospective support for sleep predicting later depressed mood.
  
  
  CONCLUSIONS
  Contrary to prediction, our results suggest in this case that depressed mood may act as a precursor to poor sleep rather than the converse.
authors.affiliation: Adelaide Institute for Sleep Health: A Flinders Centre of Research Excellence, Repatriation General Hospital, Flinders University.
authors.forename: Nicole
authors.initials: N
authors.lastname: Lovato
authors.affiliation: Centre for Sleep Research, University of South Australia.
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Short
authors.affiliation: School of Psychology, Flinders University, Adelaide, SA, Australia.
authors.forename: Gorica
authors.initials: G
authors.lastname: Micic
authors.affiliation: Department of Psychology, University of Bath, North East Somerset, UK.
authors.forename: Rachel M
authors.initials: RM
authors.lastname: Hiller
authors.affiliation: School of Psychology, Flinders University, Adelaide, SA, Australia.
authors.forename: Michael
authors.initials: M
authors.lastname: Gradisar
keywords: adolescence; depressive symptoms; prospective; school-based; sleep disturbance