Titova Olga E, Lindberg Eva, Elmståhl Sölve, Lind Lars, Benedict Christian
Unit of Medical Epidemiology, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.
Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden.
J Sleep Res. 2022 Feb;31(1):e13453. doi: 10.1111/jsr.13453. Epub 2021 Aug 5.
Subjective sleep reports are widely used research tools in epidemiology. Whether sleep reports can differ between seasons is less clear. Using multivariable binary or multinomial logistic regression analyses, in the present Swedish cross-sectional two-centre cohort study (N = 19,254; mean age 61 years), we found that participants surveyed during the summer (June-August) were more likely to report short sleep duration (defined as ≤ 6 hr) compared with those interviewed during the autumn (odds ratio [95% confidence interval] = 1.14 [1.04-1.25]). Individuals interviewed in the winter (December-February) were less likely to report early awakenings compared with participants surveyed in the autumn (September-November; odds ratio [95% confidence interval] = 0.85 [0.75-0.96]). Complaints of difficulties in falling asleep and disturbed sleep were less common among participants interviewed during spring (March-May) compared with those interviewed during the autumn (odds ratio [95% confidence interval] = 0.86 [0.74-0.99] and 0.88 [0.79-0.98], respectively). No seasonal variations in reports of long sleep, difficulty maintaining sleep, or feeling not rested after sleep were observed. Additional subgroup analysis revealed that summer participants were more likely to report short sleep duration and early morning awakenings than individuals surveyed in winter. In conclusion, this Swedish study indicates that self-reported sleep characteristics may vary across seasons. Further studies are needed to confirm our findings.
主观睡眠报告是流行病学中广泛使用的研究工具。睡眠报告在不同季节是否存在差异尚不清楚。在这项瑞典的横断面双中心队列研究（N = 19254；平均年龄61岁）中，我们使用多变量二元或多项逻辑回归分析发现，与秋季接受访谈的参与者相比，夏季（6月至8月）接受调查的参与者更有可能报告睡眠时间短（定义为≤6小时）（优势比[95%置信区间]=1.14[1.04 - 1.25]）。与秋季（9月至11月）接受调查的参与者相比，冬季（12月至2月）接受访谈的个体报告早醒的可能性较小（优势比[95%置信区间]=0.85[0.75 - 0.96]）。与秋季接受访谈的参与者相比，春季（3月至5月）接受访谈的参与者中，入睡困难和睡眠障碍的抱怨较少见（优势比[95%置信区间]分别为0.86[0.74 - 0.99]和0.88[0.79 - 0.98]）。未观察到长睡眠时间、难以维持睡眠或睡眠后感觉未休息的报告存在季节性差异。进一步的亚组分析显示，夏季参与者比冬季接受调查的个体更有可能报告睡眠时间短和早醒。总之，这项瑞典研究表明，自我报告的睡眠特征可能随季节而变化。需要进一步的研究来证实我们的发现。
