入睡：睡眠潜伏期的决定因素。
Falling asleep: the determinants of sleep latency.
作者信息
Nixon G M, Thompson J M D, Han D Y, Becroft D M O, Clark P M, Robinson E, Waldie K E, Wild C J, Black P N, Mitchell E A
机构信息
Ritchie Centre for Baby Health Research, Monash Institute of Medical Research, Monash University, Melbourne, Australia.
出版信息
Arch Dis Child. 2009 Sep;94(9):686-9. doi: 10.1136/adc.2009.157453. Epub 2009 Jul 24.
BACKGROUND
Difficulty falling asleep (prolonged sleep latency) is a frequently reported problem in school-aged children.
AIMS
This study aimed to describe the distribution of sleep latency and factors that influence its duration.
METHODS
871 children of European mothers were recruited at birth. 591 (67.9%) children took part in the follow-up at 7 years of age. Sleep and daytime activity were measured objectively by an actigraph worn for 24 h.
RESULTS
Complete sleep data were available for 519 children (87.8%) with a mean age of 7.3 years (SD 0.2). Median sleep latency was 26 minutes (interquartile range 13-42). Higher mean daytime activity counts were associated with a decrease in sleep latency (-1.2 minutes per 102 movement count per minute, p = 0.05). Time spent in sedentary activity was associated with an increase in sleep latency (3.1 minutes per hour of sedentary activity, p = 0.01).
CONCLUSIONS
These findings emphasise the importance of physical activity for children, not only for fitness, cardiovascular health and weight control, but also for promoting good sleep.
背景
入睡困难（睡眠潜伏期延长）是学龄儿童中经常报告的问题。
目的
本研究旨在描述睡眠潜伏期的分布及其持续时间的影响因素。
方法
招募了871名母亲为欧洲人的儿童，他们在出生时被纳入研究。591名（67.9%）儿童在7岁时参与了随访。通过佩戴24小时的活动记录仪客观测量睡眠和白天活动情况。
结果
共有519名儿童（87.8%）获得了完整的睡眠数据，平均年龄为7.3岁（标准差0.2）。睡眠潜伏期的中位数为26分钟（四分位间距13 - 42分钟）。较高的平均白天活动计数与睡眠潜伏期缩短相关（每分钟每102次活动计数减少1.2分钟，p = 0.05）。久坐活动时间与睡眠潜伏期延长相关（每小时久坐活动增加3.1分钟，p = 0.01）。
结论
这些发现强调了身体活动对儿童的重要性，不仅关乎健康、心血管健康和体重控制，还对促进良好睡眠具有重要意义。
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