Husby R, Lingjaerde O
Institute of Community Medicine, University of Tromsø, Norway.
Acta Psychiatr Scand. 1990 Jun;81(6):542-7. doi: 10.1111/j.1600-0447.1990.tb05009.x.
As part of a comprehensive population health survey in the municipality of Tromsø, north of the Arctic Circle, men between 20 and 54 years and women between 20 and 49 years were presented a questionnaire containing questions about sleeplessness and its possible association with season. Of the 14,667 respondents, 41.7% of the women and 29.9% of the men said they were sometimes bothered by insomnia. Insomnia not associated with any special time of the year was reported by 16.9% of women and 16.2% of men; insomnia in the "dark period" (midwinter insomnia) was reported by 17.6% of women and 9.0% of men; insomnia in the midnight-sun period or in spring or autumn was much less common. Difficulty falling asleep was the most common type of insomnia, especially in winter and summer. Overall, the frequency of insomnia increased with increasing age, but with some notable differences with regard to type (initial insomnia showed little relation to age, whereas middle and late insomnia increased markedly with age) and seasonal type (insomnia in the midnight-sun period decreased with age, whereas the other seasonal types increased with age).
作为对北极圈以北特罗姆瑟市进行的一项全面人口健康调查的一部分，20至54岁的男性和20至49岁的女性收到了一份问卷，其中包含有关失眠及其与季节可能关联的问题。在14667名受访者中，41.7%的女性和29.9%的男性表示他们有时会受到失眠困扰。16.9%的女性和16.2%的男性报告称失眠与一年中的任何特定时间无关；17.6%的女性和9.0%的男性报告称在“黑暗时期”（仲冬失眠）出现失眠；在极昼时期、春季或秋季出现失眠的情况则要少得多。入睡困难是最常见的失眠类型，尤其是在冬季和夏季。总体而言，失眠的频率随年龄增长而增加，但在类型（初始失眠与年龄关系不大，而中期和晚期失眠随年龄显著增加）和季节性类型（极昼时期的失眠随年龄下降，而其他季节性类型随年龄增加）方面存在一些显著差异。
