A warmer indoor environment in the evening and shorter sleep onset latency in winter: The HEIJO-KYO study.
A warmer indoor environment in the evening and shorter sleep onset latency in winter: The HEIJO-KYO study.
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晚上更温暖的室内环境和冬季更短的入睡潜伏期：HEIJO-KYO 研究。
DOI：
10.1016/j.physbeh.2015.05.022
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Kurumatani N.
中科院分区：
文献类型：
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作者：
Saeki K;Obayashi K;Tone N;Kurumatani N.
入睡困难是一个重要的问题，因为它与抑郁症、糖尿病、心肌梗死和更高的全因死亡率的发病率有关。尽管在受控环境中的实验研究表明，睡前四肢（脚和手）的温暖皮肤温度与较短的睡眠起始潜伏期（SOL）相关，但来自真实的生活情况的证据有限。我们评估了861名居家老年人的夜间（睡前2小时）室内温度与SOL之间的关系。根据自我管理的睡眠日记确定主观SOL。活动（客观）SOL，室内温度和床温同时测量在参与者的家中48小时，在寒冷的季节（10月至4月）。使用多水平线性回归模型对个体参与者进行随机截距，评估夜间室内温度与SOL之间的关联。夜间室内温度与对数转换的主观SOL（β = − 0.021，P < 0.01）和活动记录SOL（β = − 0.019，P < 0.01）呈显著负相关，与潜在的混杂因素（包括性别、失眠药物、夜间体力活动和就寝时间）无关。就寝后2小时内较高的床温与较短的对数转换的活动记录SOL显着相关（β =-0.028，P < 0.01）。即使在调整了夜间室外温度后，这些显著的相关性仍保持不变。本研究的临床重要发现表明，通过改变夜间室内温度和就寝后2小时的床温，可以缩短SOL。
Difficulty in initiating sleep is an important problem because it is associated with an increased incidence of depression, diabetes, myocardial infarction, and higher all-cause mortality. Although experimental studies in controlled settings have shown that warm skin temperature of the extremities (feet and hands) before bedtime is associated with shorter sleep onset latency (SOL), evidence from real life situations is limited. We assessed the relationship between indoor temperatures in the evening (2 h before bedtime) and SOL among 861 home-dwelling elderly participants. Subjective SOL was determined according to a self-administered sleep diary. Actigraphic (objective) SOL, indoor temperature, and bed temperature were simultaneously measured at participants' homes for 48 h during the colder seasons (October–April). The association between evening indoor temperature and SOL was assessed using a multilevel linear regression model with random intercept for individual participants. Evening indoor temperature showed a significant inverse association with log-transformed subjective SOL (β = − 0.021,P< 0.01) and actigraphic SOL (β = − 0.019,P< 0.01), independent of potential confounders including gender, insomnia medication, evening physical activity, and bedtime. Higher bed temperature during the 2 h after bedtime was significantly associated with shorter log-transformed actigraphic SOL (β = − 0.028,P< 0.01). These significant associations were maintained even after adjustment for evening outdoor temperature. The clinically important findings of the present study indicate that SOL may be shortened by modification of evening indoor temperature and bed temperature for 2 h after bedtime.