Prevalence and risk factors of subjective sleepiness in the general adult population

Sleep. 2007 May;30(5):619-24. doi: 10.1093/sleep/30.5.619.


Study objectives: The aim of this study was to investigate the prevalence and risk factors of self-reported excessive daytime sleepiness (EDS) in Norway.

Design: The Epworth Sleepiness Scale was administered by a telephone interview to a random sample of 2301 adult inhabitants of Norway. Questions of demography, symptoms of sleep disorders, and depression were included.

Setting: Norway.

Participants: Two thousand three hundred one subjects, 18 years and older.

Interventions: N/A.

Measurements and results: The mean score of the Epworth Sleepiness Scale was 6.95 (SD = 3.8), and 17.7% had a score (> 10), indicating EDS. Univariate logistic regression analyses showed that being a man; living in southern Norway; working nights; being young; having symptoms of cataplexy, restless legs, or periodic limb movement in sleep; having breathing pauses in sleep; and having symptoms of depression were significantly related to EDS. Of these 9 predictors, only symptoms of restless legs did not maintain the significant relationship with EDS when a multiple logistic regression analysis was performed.

Conclusions: The prevalence of EDS was high in this adult Norwegian population sample. EDS seems to be related to several symptoms of sleep disorders.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Cross-Sectional Studies
  • Disorders of Excessive Somnolence / epidemiology*
  • Disorders of Excessive Somnolence / etiology
  • Female
  • Health Surveys
  • Humans
  • Male
  • Middle Aged
  • Norway
  • Regression Analysis
  • Risk Factors