title: Daytime sleepiness: an epidemiological study of young adults.
abstract: OBJECTIVE
  Although excessive daytime sleepiness is associated with increased risks for accidents, decreased productivity, and interpersonal difficulties, information on its epidemiology is scarce. This paper examines correlates of and suspected risk factors for daytime sleepiness from a longitudinal epidemiological study of young adults.
  
  
  METHODS
  The sample consisted of 1007 randomly selected young adults from a large health maintenance organization in southeast Michigan. Data were gathered in personal interviews conducted with 97% of the sample 5.5 years after baseline. Information on sleep characteristics in the last 2 weeks, including daytime sleepiness, nocturnal sleep onset, snoring, and hours of sleep, was collected on a self-administered instrument. Psychiatric disorders were measured by the National Institute of Mental Health's Diagnostic Interview Schedule.
  
  
  RESULTS
  The average length of nocturnal sleep on weekdays was 6.7 hours. Daytime sleepiness was inversely related to hours of sleep and positively related to the ease of falling asleep at night; it varied significantly by employment and marital status. Snoring was associated with increased daytime sleepiness, as was recent major depression.
  
  
  CONCLUSIONS
  Factors that might increase daytime sleepiness among young adults include social factors (being single and being employed full time) and pathological conditions (frequent snoring and major depression).
authors.affiliation: Department of Psychiatry, Henry Ford Health Sciences Center, Detroit, Mich. 48202-3450, USA. nbreslal@hfhs.org
authors.forename: N
authors.initials: N
authors.lastname: Breslau
authors.forename: T
authors.initials: T
authors.lastname: Roth
authors.forename: L
authors.initials: L
authors.lastname: Rosenthal
authors.forename: P
authors.initials: P
authors.lastname: Andreski
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D003866:Depressive Disorder / Q000150:complications; D004522:Educational Status; D004651:Employment; D005260:Female; D006801:Humans; D008297:Male; D017533:Marital Status; D008824:Michigan / Q000453:epidemiology; D011897:Random Allocation; D012044:Regression Analysis; D012890:Sleep; D012893:Sleep Wake Disorders / Q000453:epidemiology* / Q000209:etiology; D012913:Snoring / Q000150:complications; D012923:Social Class