Daily Profiles of Light Exposure and Evening Use of Light-emitting Devices in Young Adults Complaining of a Delayed Sleep Schedule
Daily Profiles of Light Exposure and Evening Use of Light-emitting Devices in Young Adults Complaining of a Delayed Sleep Schedule
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DOI：
10.1177/0748730418757007
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发表时间：
2018-02
影响因子：
3.5
通讯作者：
Solenne Van der Maren;Christophe Moderie;C. Duclos;J. Paquet;Véronique Daneault;M. Dumont
中科院分区：
文献类型：
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作者：
Solenne Van der Maren;Christophe Moderie;C. Duclos;J. Paquet;Véronique Daneault;M. Dumont
许多因素可能导致睡眠时间表延迟。一个重要的因素可能是有利于较晚的昼夜节律阶段的光暴露的每日概况。这项研究旨在比较14名抱怨睡眠时间延迟的年轻人和14名匹配的对照组之间的光照情况，并确定习惯性光照和昼夜节律之间可能存在的联系。连续7天用流动监测仪记录白色和蓝光暴露。参与者还记录了他们每天睡前使用发光设备的情况。内源性昼夜节律时相在实验室条件下采用暗光褪黑激素起始（DLMO）法测定。受试者暴露的明暗周期的幅度在延迟组比对照组小，并且较小的幅度与较晚的DLMO相关。较小的振幅是由于白天暴露减少和夜间暴露增加。延迟受试者的蓝光总暴露量较低，但白色光总暴露量不高，这可能是由于暴露于富含蓝光的室外光线较少。较低的蓝光日暴露量与较晚的DLMO相关。还比较了两组之间与内源性昼夜节律相相关的光照相对增加和减少的时间。在延迟受试者中，DLMO后2小时（具有最大相位延迟效应的昼夜节律时间）暴露于白色和蓝色光相对较高。延迟的参与者在DLMO后8至10小时也有更高的光照暴露，这主要发生在他们的睡眠期间，但可能有一些相位提前效应。自我报告的睡前使用发光设备的延迟比对照组高，并与较晚的DLMO。这项研究表明，抱怨睡眠时间延迟的人会从事与光线有关的行为，这些行为有利于更晚的昼夜节律和更晚的就寝时间。
A number of factors can contribute to a delayed sleep schedule. An important factor could be a daily profile of light exposure favoring a later circadian phase. This study aimed to compare light exposure between 14 young adults complaining of a delayed sleep schedule and 14 matched controls and to identify possible associations between habitual light exposure and circadian phase. Exposure to white and blue light was recorded with ambulatory monitors for 7 consecutive days. Participants also noted their daily use of light-emitting devices before bedtime. Endogenous circadian phase was estimated with the dim light melatonin onset (DLMO) in the laboratory. The amplitude of the light-dark cycle to which the subjects were exposed was smaller in delayed than in control subjects, and smaller amplitude was associated with a later DLMO. Smaller amplitude was due to both decreased exposure in the daytime and increased exposure at night. Total exposure to blue light, but not to white light, was lower in delayed subjects, possibly due to lower exposure to blue-rich outdoor light. Lower daily exposure to blue light was associated with a later DLMO. Timing of relative increases and decreases of light exposure in relation to endogenous circadian phase was also compared between the 2 groups. In delayed subjects, there was a relatively higher exposure to white and blue light 2 h after DLMO, a circadian time with maximal phase-delaying effect. Delayed participants also had higher exposure to light 8 to 10 h after DLMO, which occurred mostly during their sleep episode but may have some phase-advancing effects. Self-reported use of light-emitting devices before bedtime was higher in delayed than in control subjects and was associated with a later DLMO. This study suggests that individuals complaining of a delayed sleep schedule engage in light-related behaviors favoring a later circadian phase and a later bedtime.