STUDY OBJECTIVE: To report the distribution of various sleep parameters in a population-based study. DESIGN: Population-based cross-sectional study with self-administered questionnaires. SETTING: Conducted as part of the Hordaland Health Study '97-'99 in collaboration with the Norwegian National Health Screening Service. @entity1 : 8860 subjects, aged 40 to 45 years, answered the sleep questionnaire part of the study. INTERVENTIONS: N/A. MEASUREMENTS AND RESULTS: Reports on habitual bedtimes, rise times, subjective @entity25 , and various sleep characteristics were used in this study. Mean (+/- SD) nocturnal sleep duration during weekdays in @entity1 was 6 hours 52 minutes (+/- 55 minutes); in @entity1 7 hours 11 minutes (+/- 57 minutes). Mean subjective @entity25 was 7 hours 16 minutes (+/- 52 minutes) in @entity1 ; 7 hours 45 minutes (+/- 52 minutes) in @entity1 . Sleep duration was shorter in shift workers and longer in married subjects and in those living in rural areas. Subjective @entity25 was higher in subjects reporting poor subjective health and in subjects living in rural areas. In total, these variables accounted for only around 3% of the variance in sleep duration and @entity25 . Ten percent of the @entity1 and 12.2% of the @entity1 reported frequent @entity22 . CONCLUSIONS: The wide distribution of sleep duration and subjective @entity25 indicate large interindividual variations in these parameters. There were pronounced sex differences in these variables and in most of the sleep characteristics studied. Shift work, @entity22550 , marital status, and education in @entity1 were sources of significant, but small, variations in sleep duration.

Sleep duration, subjective XXXX , and sleep habits of 40- to 45-year-olds in the Hordaland Health Study.

@entity1 :: ('9606', 'Species') :: ['women', 'PARTICIPANTS', 'men'] @entity22550 :: ('MESH:C538276', 'Disease') :: ['urban-rural living'] @entity25 :: ('MESH:D012893', 'Disease') :: ['sleep need'] @entity22 :: ('MESH:D007319', 'Disease') :: ['insomnia']
@entity25 :: (MESH:D012893,Disease) :: ['sleep need']
