title: Relation of chronotype to sleep complaints in the general Finnish population.
abstract: Individuals show variation in their preference for the daily timing of activities. In this study the authors analyzed whether chronotypes associate with sleep duration and sleep-related complaints. The authors used the National FINRISK Study 2007 Survey data on 3696 women and 3162 men, representative of the Finnish population aged 25 yrs and older, for the assessment of chronotype and self-reported sleep. Evening types experienced insomnia symptoms, had nightmares, and had used recently hypnotics significantly more often than other chronotypes among both men and women. In a multinominal logistic regression model predicting insufficient sleep, the association of eveningness with insufficient sleep was not abolished after adjustment for sex, age, and sleep duration. The prevalence of short sleepers was significantly higher in evening types among men than among women, whereas that of long sleepers was significantly higher in evening types among both men and women, as compared with the other chronotypes. These results indicate that eveningness predisposes individuals to a range of sleep complaints.
authors.affiliation: Department of Mental Health and Substance Abuse Services, National Institute for Health and Welfare, Helsinki, Finland. ilona.merikanto@helsinki.fi
authors.forename: Ilona
authors.initials: I
authors.lastname: Merikanto
authors.forename: Erkki
authors.initials: E
authors.lastname: Kronholm
authors.forename: Markku
authors.initials: M
authors.lastname: Peltonen
authors.forename: Tiina
authors.initials: T
authors.lastname: Laatikainen
authors.forename: Tuuli
authors.initials: T
authors.lastname: Lahti
authors.forename: Timo
authors.initials: T
authors.lastname: Partonen
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology / Q000523:psychology; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D005387:Finland / Q000453:epidemiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012727:Sex Characteristics; D020178:Sleep Disorders, Circadian Rhythm / Q000453:epidemiology / Q000209:etiology* / Q000503:physiopathology / Q000523:psychology; D007319:Sleep Initiation and Maintenance Disorders / Q000209:etiology / Q000503:physiopathology / Q000523:psychology; D011795:Surveys and Questionnaires