Huang Xiao-Na, Wang Hui-Shan, Lu Xi-Cheng, Jiang Jing-Xiong, An Lin
Department of Child Health, National Center for Maternal and Child Health, Chinese Center for Disease Prevention and Control, Beijing 100013, China.
Zhonghua Er Ke Za Zhi. 2009 Jul;47(7):499-503.
This was a nationwide study of sleep circadian in term infants. The aim was to understand the development characteristics of infants' sleep/wake patterns longitudinally in their own home environments over the first 12 months of life.
Totally 524 healthy term infants from 9 urban districts took part in this project Their sleep/wake patterns over 24 h were recorded using parental sleep diaries, from the 2nd day to 12 months old.
The results showed that infant daytime sleep changed significantly at 0-2, 3-4, 5-6, and 8-9 months after birth, and the change was the fastest in the first month, the mean percentage of daytime sleep decreased from 82.4% at Day 2 to 62.8% at 1 month old. Also, the average number of naps reduced from 3.7 to 2 across the infancy. The ability of continuous sleep throughout the night gradually enhanced from 1 month old, and the nocturnal longest sleep time extended to 6.8 h at 4 months of age as well as the nighttime awakening frequency less than 0.5 over 6 months old. Additionally, the nighttime sleep increased significantly at 4 and 9 months after birth, where the proportion of nighttime sleep increased from 55.8% at Day 2 to 64.3% of 4 months and 71.2% of 9 months respectively. In general, the total sleep time over a 24 h period presented a downward trend as the infant aged.
The periods 0-6 and 8-9 months after birth were the key periods for the development of infant sleep.
这是一项针对足月儿睡眠昼夜节律的全国性研究。目的是纵向了解婴儿在出生后头12个月在自己家中环境下的睡眠/觉醒模式的发育特征。
来自9个市区的524名健康足月儿参与了该项目。从出生第2天到12个月，使用父母睡眠日记记录他们24小时的睡眠/觉醒模式。
结果显示，婴儿出生后0 - 2、3 - 4、5 - 6和8 - 9个月时白天睡眠有显著变化，且在第一个月变化最快，白天睡眠的平均百分比从出生第2天的82.4%降至1个月大时的62.8%。此外，整个婴儿期午睡的平均次数从3.7次减少到2次。从1个月大开始，整夜持续睡眠的能力逐渐增强，4个月大时夜间最长睡眠时间延长至6.8小时，6个月大后夜间觉醒频率低于0.5次。此外，出生后4个月和9个月时夜间睡眠显著增加，夜间睡眠比例分别从出生第2天的55.8%增至4个月时的64.3%和9个月时的71.2%。总体而言，随着婴儿年龄增长，24小时内的总睡眠时间呈下降趋势。
出生后0 - 6个月和8 - 9个月是婴儿睡眠发育的关键时期。
