title: How age and daytime activities are related to insomnia in the general population: consequences for older people.
abstract: OBJECTIVE
  To determine the role of activity status and social life satisfaction on the report of insomnia symptoms and sleeping habits.
  
  
  METHODS
  Cross-sectional telephone survey using the Sleep-EVAL knowledge base system.
  
  
  METHODS
  Representative samples of three general populations (United Kingdom, Germany, and Italy).
  
  
  METHODS
  13,057 subjects age 15 and older: 4,972 in the United Kingdom, 4,115 in Germany, and 3,970 in Italy. These subjects were representative of 160 million inhabitants.
  
  
  METHODS
  Clinical questionnaire on insomnia and investigation of associated pathologies (psychiatric and neurological disorders).
  
  
  RESULTS
  Insomnia symptoms were reported by more than one-third of the population age 65 and older. Multivariate models showed that age was not a predictive factor of insomnia symptoms when controlling for activity status and social life satisfaction. The level of activity and social interactions had no influence on napping, but age was found to have a significant positive effect on napping.
  
  
  CONCLUSIONS
  These results indicate that the aging process per se is not responsible for the increase of insomnia often reported in older people. Instead, inactivity, dissatisfaction with social life, and the presence of organic diseases and mental disorders were the best predictors of insomnia, age being insignificant. Healthy older people (i.e., without organic or mental pathologies) have a prevalence of insomnia symptoms similar to that observed in younger people. Moreover, being active and satisfied with social life are protective factors against insomnia at any age.
authors.affiliation: Stanford University School of Medicine, Sleep Disorder Center, California 94305, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Ohayon
authors.forename: J
authors.initials: J
authors.lastname: Zulley
authors.forename: C
authors.initials: C
authors.lastname: Guilleminault
authors.forename: S
authors.initials: S
authors.lastname: Smirne
authors.forename: R G
authors.initials: RG
authors.lastname: Priest
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D008875:Middle Aged; D010549:Personal Satisfaction; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology / Q000209:etiology*; D011795:Surveys and Questionnaires