Evening daylight may cause adolescents to sleep less in spring than in winter.
Evening daylight may cause adolescents to sleep less in spring than in winter.
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DOI：
10.3109/07420528.2010.487965
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发表时间：
2010-07
影响因子：
2.8
通讯作者：
Rea MS
中科院分区：
文献类型：
--
作者：
Figueiro MG;Rea MS
青少年普遍经历的睡眠受限可能是由于体内平衡过程造成的睡眠压力较大以及昼夜节律系统的相位延迟造成的。关于后一种可能的原因，我们假设，因为春季比冬季有更多的自然傍晚光线，所以青少年学生样本在春季会比冬季延迟更多的阶段，睡眠开始时间会更晚，而且由于固定的学校时间表，睡眠持续时间会更短。这项研究招募了16名八年级学生。我们收集了睡眠记录和唾液样本，以确定他们的暗光褪黑素开始(DLMO)，这是一个公认的昼夜节律标志。这里还报告了12个受试者的子集在冬季和春季使用个人佩戴的昼夜节律光测量设备在7天的过程中经历的实际昼夜节律光暴露。结果显示，这组青少年在春季接触到的昼夜节律光明显多于冬季，特别是在晚上，光照可能会推迟昼夜节律。与光照数据一致的是，春季的DLMO和睡眠开始时间显著延迟，睡眠持续时间显著短于冬季。目前对光线、昼夜节律和自我报告睡眠的生态学研究表明，春季更多地接触晚上的日光可能会导致青少年在上学时睡眠受限。因此，减少春季夜间光线的照明方案可能会鼓励青少年更长的睡眠时间。
Sleep restriction commonly experienced by adolescents can stem from greater sleep pressure by the homeostatic processes and from phase delays of the circadian system. With regard to the latter potential cause, we hypothesized that because there is more natural evening light during the spring than winter, a sample of adolescent students would be more phase delayed in spring than in winter, would have later sleep onset times and, because of fixed school schedules, would have shorter sleep durations. Sixteen eighth-grade subjects were recruited for the study. We collected sleep logs and saliva samples to determine their dim light melatonin onset (DLMO), a well-established circadian marker. Actual circadian light exposures experienced by a subset of twelve subjects over the course of seven days in winter and in spring using a personal, head-worn, circadian light measurement device are also reported here. Results showed that this sample of adolescents was exposed to significantly more circadian light in spring than in winter, especially in the evening hours when light exposure would likely delay circadian phase. Consistent with the light data, DLMO and sleep onset times were significantly more delayed, and sleep durations were significantly shorter in spring than in winter. The present ecological study of light, circadian phase, and self-reported sleep suggests that greater access to evening daylight in the spring may lead to sleep restriction in adolescents while attending school. Therefore, lighting schemes that reduce evening light in the spring may encourage longer sleep times in adolescents.
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影响因子：
5
作者：
COHEN, S;KAMARCK, T;MERMELSTEIN, R
通讯作者：
MERMELSTEIN, R
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Rea, MS
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Yamada, N
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通讯作者：
Dubocovich, ML
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作者：
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通讯作者：
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