The prevalence of delayed and advanced sleep phase syndromes.
Journal of Sleep Research 1993 March
To determine the prevalence of the delayed sleep phase syndrome (DSPS) and the contrasting advanced sleep phase syndrome (ASPS), a cross-sectional nationwide epidemiological study was performed in Norway. Screening questionnaires were sent to a random sample of 10,000 adult individuals (18-67 y), of both sexes, taken from the National register of Norway. The response rate was 77%. Diagnoses of DSPS and ASPS were based on International Classification of Sleep Disorders (ICSD) criteria. All individuals suspected of having DSPS or ASPS were requested to fill out a second questionnaire, and a sleep log for four weeks. Subjects for whom the suspicion of DSPS or ASPS could be upheld were contacted by telephone for a final confirmation. Of the 129 possible DSPS cases identified from the screening questionnaires, 17 (9 f; 8 m) remained with the confirmed diagnosis of DSPS. The prevalence was calculated to be 0.17% (95% Confidence Intervals: 0.10-0.28). Thirteen individuals had a mild to moderate DSPS and four had a severe DSPS. The mean age of onset was 15.4 y, and mean duration was 19.2 y. There was no significant correlation between prevalence and age. A sleep phase delay (MSPD) induced by social/environmental or psychological factors was found in 55 subjects (prevalence = 0.72%). Using strict ICSD criteria, no case of ASPS was detected, confirming earlier assumptions of the extreme rarity of this condition.
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