Nakanishi Tomoko, Yoshikawa Tatsuya, Higuchi Ryoko, Kanehisa Hiroaki, Suzuki Shihoko
Kyoritsu Women's Junior College, Tokyo, Japan.
Graduate School of Health & Social Work, Kanagawa University of Human Services, Kanagawa, Japan.
Sleep Biol Rhythms. 2022 Dec 14;21(2):193-199. doi: 10.1007/s41105-022-00435-z. eCollection 2023 Apr.
The present study aimed to elucidate weekdays' sleeping condition and its influence on occurrence of general malaise in children. A total of 761 Japanese children aged 10 to 12 years were surveyed regarding their weekdays' waking time and bedtime and general malaise using a self-administered questionnaire. As the result of hierarchical cluster analysis on the sleep condition, the participants were classified into three clusters. Sleep duration was significantly longer in cluster 1 (9.35 ± 0.52 h) than in clusters 2 (7.83 ± 0.77 h) and 3 (9.02 ± 0.30 h) and significantly longer in cluster 3 than in cluster 2. Waking time was significantly later in cluster 3 (7:01 ± 0:12) than in clusters 1 (6:22 ± 0:31) and 2 (6:24 ± 0:33, < 0.001). Bedtime was significantly later in cluster 2 (22:34 ± 0:47) than in clusters 3 (21:59 ± 0:19) and 1 (21:01 ± 0:22) and significantly later in cluster 3 than in cluster 1. There were significantly more subjects in cluster 2 than in clusters 1 and 3 who responded "nearly every day" or "occasionally" to the five of seven questionnaires related to general malaise. The current results indicate that in Japanese children aged 10 to 12 years, (1) sleeping condition of weekdays are classified into three clusters with different mean values for each of sleep duration, bedtime, and waking time, and (2) the occurrence of general malaise may be enhanced in individuals whose sleep duration is less than 8 h.
本研究旨在阐明工作日儿童的睡眠状况及其对全身不适发生情况的影响。采用自填式问卷对761名10至12岁的日本儿童进行了调查，内容涉及他们工作日的起床时间、就寝时间和全身不适情况。作为对睡眠状况进行分层聚类分析的结果，参与者被分为三组。第1组的睡眠时间（9.35±0.52小时）显著长于第2组（7.83±0.77小时）和第3组（9.02±0.30小时），且第3组显著长于第2组。第3组的起床时间（7:01±0:12）显著晚于第1组（6:22±0:31）和第2组（6:24±0:33，P<0.001）。第2组的就寝时间（22:34±0:47）显著晚于第3组（21:59±0:19）和第1组（21:01±0:22），且第3组显著晚于第1组。在与全身不适相关的七份问卷中的五份中，回答“几乎每天”或“偶尔”的第2组受试者显著多于第1组和第3组。目前的结果表明，在10至12岁的日本儿童中，（1）工作日的睡眠状况分为三组，每组的睡眠时间、就寝时间和起床时间均值不同，（2）睡眠时间少于8小时的个体全身不适的发生率可能会增加。
