title: Genetic and environmental influences on sleep problems: a study of preadolescent and adolescent twins.
abstract: OBJECTIVE
  The aim of this study was to examine the extent to which additive genetic, shared environmental and non-shared environmental factors contribute to adolescent and preadolescent sleep problems.
  
  
  METHODS
  The sample consisted of a cohort of 270 monozygotic and 246 dizygotic twins from a university-based twin registry.
  
  
  RESULTS
  Results demonstrated that genetic and environmental influences each appear to be important to adolescent sleep problems.
  
  
  CONCLUSIONS
  While the magnitude of genetic influence on sleep problems was consistent with findings from the adult literature, it was smaller than in studies with younger children, suggesting genetic effects may be less influential in adolescence and adulthood.
authors: Sleep Center, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA. mooremel@email.chop.edu
authors: M
authors: M
authors: Moore
authors: J
authors: J
authors: Slane
authors: J A
authors: JA
authors: Mindell
authors: S A
authors: SA
authors: Burt
authors: K L
authors: KL
authors: Klump
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D012893:Sleep Wake Disorders / Q000209:etiology / Q000235:genetics*; D012931:Social Environment; D014429:Twins, Dizygotic / Q000235:genetics*; D014430:Twins, Monozygotic / Q000235:genetics*