Associations between seasonal variations in day length (photoperiod), sleep timing, sleep quality and mood: a comparison between Ghana (5째) and Norway (69째)
Associations between seasonal variations in day length (photoperiod), sleep timing, sleep quality and mood: a comparison between Ghana (5째) and Norway (69째)
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DOI：
10.1111/j.1365-2869.2011.00982.x
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发表时间：
2012-04-01
影响因子：
4.4
通讯作者：
Pallesen, Stale
中科院分区：
文献类型：
--
作者：
Friborg, Oddgeir;Bjorvatn, Bjorn;Pallesen, Stale
研究了日长（光周期）是否是保持昼夜节律进入24小时周期的重要时间表（时间给予者）的假设，以及其与睡眠模式和情绪问题的关系。数据收集前瞻性地从一个网站非常大的差异，在日光持续时间跨季节（挪威特罗姆瑟，69度39 'N）和一个网站非常小的季节差异，在日光持续时间（加纳在阿克拉，5度32' N）。1月份，从这两个地点招募了200名受试者。在8月的随访中，加纳和挪威分别有180名和150名受试者参与。每周睡眠日记的使用表明，只有在北方纬度，起床和就寝时间、睡眠效率和睡眠开始潜伏期的季节性变化较低至中等强度。没有观察到睡眠时间或夜间觉醒的季节性变化。自我报告的措施表明，中度到强烈的季节性差异失眠和疲劳，并在挪威抑郁情绪的差异较弱，但小到不存在的季节性差异在加纳。缺乏日光与延迟起床和就寝时间、增加入睡问题、白天疲劳和抑郁情绪有关。然而，总睡眠时间和睡眠质量似乎不受影响。
The hypothesis of whether day length (photoperiod) is an important zeitgeber (time-giver) for keeping the circadian rhythm entrained to a 24-hour cycle was examined, as was its association with sleep patterns and mood problems. Data were collected prospectively from a site with very large differences in daylight duration across seasons (Tromso in Norway, 69 degrees 39'N) and a site with very small seasonal differences in daylight duration (Ghana in Accra, 5 degrees 32'N). Two hundred subjects were recruited from both sites in January. At the follow-up in August, 180 and 150 subjects in Ghana and Norway participated, respectively. Use of a weekly sleep diary indicated low to moderately strong seasonal changes in rise- and bedtime, sleep efficiency and sleep onset latency only in the northern latitude. No seasonal changes in sleep duration or night awakenings were observed. The self-report measures indicated moderate to strong seasonal differences in insomnia and fatigue, and weaker differences in depressed mood in Norway, but small to non-existing seasonal differences in Ghana. Lack of daylight was related to phase-delayed rise- and bedtimes, increased problems falling asleep, daytime fatigue and depressive mood. However, total sleep duration and sleep quality appeared unaffected.