Sleep timing, chronotype, mood, and behavior at an Arctic latitude (69°N)
Sleep timing, chronotype, mood, and behavior at an Arctic latitude (69°N)
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DOI：
10.1016/j.sleep.2014.03.014
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发表时间：
2014-07-01
期刊：
影响因子：
4.8
通讯作者：
Gradisar, Michael
中科院分区：
文献类型：
--
作者：
Friborg, Oddgeir;Rosenvinge, Jan H.;Gradisar, Michael
目的：日光是将昼夜节律带入24小时时钟周期的重要时间表，特别是在极圈内，每年有几个月的极夜。睡眠定时中可能发生相位延迟，但平均偏移通常很小。然而，相移的个体差异很大，涉及调节因素。在这里，我们研究了几个自我调节变量的作用，（情绪和疲劳、行为习惯和心理自我调节）作为睡眠时间和时间类型的季节性调节因子。（76%为女性;平均年龄：女性23.4岁，男性24.3岁）参加了一项跨三个季节的前瞻性研究（9月、12月、3月）在挪威特罗姆瑟，北纬69度39分。睡眠日记和睡眠/健康相关的问卷调查数据收集在每个time-point.Results：睡眠时间和时钟类型延迟在黑暗时期（12月）相比，较明亮的光周期（9月和3月）。在失眠、疲劳、情绪（抑郁和焦虑）、主观健康投诉、体育活动和学校相关压力方面观察到了类似的效果。最重要的是，抑郁症和疲劳缓和的程度，季节性变化的睡眠时间，而其他自我调节指标没有（即饮食习惯，身体活动，心理自我调节）。结论：季节性睡眠时间和时钟型得到证实，似乎抑郁症状在黑暗时期加剧相移问题的人生活在亚北极地区。(C)2014爱思唯尔有限公司版权所有。
Objective: Daylight is an important zeitgeber for entraining the circadian rhythm to a 24 h clock cycle, especially within the Polar circle, which has long Polar nights several months each year. Phase delays in sleep timing may occur, but the mean shift is normally small. However, the individual variation in phase shifts is large, implicating moderating factors. Here we examined the role of several self-regulatory variables (mood and fatigue, behavioral habits, and psychological self-regulation) as moderators of seasonality in sleep timing and chronotype.Methods: A sample of 162 young adults (76% females; mean age: females 23.4 years, males 24.3 years) participated in a prospective study across three seasons (September, December, March) in Tromso/Norway at 69 degrees 39'N. Sleep diary and sleep/health-related questionnaire data were collected at each time-point.Results: Sleep timing and chronotype were delayed during the dark period (December) compared with brighter photoperiods (September and March). Comparable effects were observed for insomnia, fatigue, mood (depression and anxiety), subjective health complaints, physical activity, and school-related stress. Most importantly, depression and fatigue moderated the degree of seasonal shifting in sleep timing, whereas the other self-regulation indicators did not (ie eating habits, physical activity, and psychological self-regulation).Conclusion: Seasonality in sleep timing and chronotype was confirmed, and it seems that depressive symptoms during the dark period exacerbate phase-shifting problems for people living in sub-Arctic regions. (C) 2014 Elsevier B.V. All rights reserved.