Prevalence and correlates of delayed sleep phase in high school students

Abstract Purpose To investigate prevalence and correlates of delayed sleep phase, characterized by problems falling asleep in the evening and rising at adequate times in the morning, in a large sample of Norwegian high school students. Methods A randomized sample of 1285 high school students (aged 1...

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Bibliographic Details
Published in:Sleep medicine 2012-02, Vol.13 (2), p.193-199
Main Authors: Saxvig, Ingvild W, Pallesen, Ståle, Wilhelmsen-Langeland, Ane, Molde, Helge, Bjorvatn, Bjørn
Format: Article
Language:English
Subjects:
Adolescent
Adolescents
Alcohol Drinking - epidemiology
Anxiety - epidemiology
Circadian rhythm
Circadian Rhythm - physiology
Delayed sleep phase syndrome
Depression - epidemiology
Educational Status
Female
Humans
Male
Neurology
Norway - epidemiology
Prevalence
Sleep
Sleep Disorders, Circadian Rhythm - epidemiology
Sleep Disorders, Circadian Rhythm - physiopathology
Sleep Disorders, Circadian Rhythm - psychology
Sleep Medicine
Sleep patterns
Sleep Stages - physiology
Smoking - epidemiology
Students - statistics & numerical data
Surveys and Questionnaires
Young Adult
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Summary:Abstract Purpose To investigate prevalence and correlates of delayed sleep phase, characterized by problems falling asleep in the evening and rising at adequate times in the morning, in a large sample of Norwegian high school students. Methods A randomized sample of 1285 high school students (aged 16–19 years) participated in an internet based study answering questions about sleep habits, height, weight, smoking, alcohol use, school grades, and anxiety and depression symptoms. Delayed sleep phase was operationalized as difficulties falling asleep before 2 a.m. at least three nights per week together with much or very much difficulty waking up in the morning. Results The results show a prevalence of delayed sleep phase of 8.4%. In all, 68% of these students (5.7% of the total sample) also reported problems advancing their sleep period as well as one daytime consequence (oversleeping at least two days a week or experiencing much/very much sleepiness at school). Delayed sleep phase was associated with lower average school grades, smoking, alcohol usage, and elevated anxiety and depression scores. Conclusions Delayed sleep phase appears to be common amongst Norwegian adolescents and is associated with negative outcomes such as lower average school grades, smoking, alcohol usage, and elevated anxiety and depression scores.
ISSN:1389-9457
1878-5506
DOI:10.1016/j.sleep.2011.10.024