The aim was to examine the interrelationship between sleep quality of 1-month infants and mothers, mothers’ corresponding activities to infant’s night sleep, and mother’s mental health. A cross-sectional survey with self-reported questionnaire was conducted among 437 healthy mother–infant pairs at 1-month postpartum delivered at a maternal hospital in Tokyo. The main measurements were the presence of mother’s sleep problem, the presence of infant’s unstable sleep quality (hereinafter, unstable sleep), mother’s stimulating activities, such as responding to active sleep immediately, and four indices of mothers’ mental health. After comparing statistically, the basic characteristics and above main measurements with and without infant unstable sleep, a covariance structure analysis was conducted to investigate the association among four main measurements according to the hypotheses made based on previous studies. The infants’ unstable sleep affected the mothers’ sleep problem ( β = 0.12), the mothers’ sleep problem affected the stimulating activities ( β = 0.11) and the stimulating activities affected the infants’ unstable sleep ( β = 0.11). The infants’ unstable sleep and mothers’ sleep problem affected the mothers’ mental health directly ( β = 0.20, β = 0.15). The values of GFI (0.993, AGFI (0) and RMSEA (0.032) showed a high fitness of the model. The inter-relationships between the infants’ unstable sleep, mothers’ sleep problem, mothers' stimulating activities, and mothers’ mental health were verified in just 1 month post birth. It is significant that those relationships were obtained in the neonatal periods. The result that mothers’ stimulating activities affect infants’ unstable sleep is important with implications on sleep health education.

中文翻译：

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1月龄婴儿睡眠质量与其母亲相应活动的关系

目的是检验1个月大婴儿与母亲的睡眠质量、母亲对婴儿夜间睡眠的相应活动以及母亲心理健康之间的相互关系。对在东京一家产妇医院分娩的 437 对产后 1 个月的健康母婴进行了一项带有自我报告问卷的横断面调查。主要测量指标为有无母亲睡眠问题、有无婴儿睡眠质量不稳定（以下简称不稳定睡眠）、有无母亲刺激性活动，如立即对积极睡眠作出反应，以及有无母亲心理健康四项指标。经统计比较，有无婴儿不稳定睡眠的基本特征及以上主要测量值，根据基于先前研究做出的假设，进行了协方差结构分析以研究四个主要测量值之间的关联。婴儿睡眠不稳定影响母亲睡眠问题（β=0.12），母亲睡眠问题影响刺激活动（β=0.11），刺激活动影响婴儿睡眠不稳定（β=0.11）。婴儿睡眠不稳定和母亲睡眠问题直接影响母亲的心理健康（β=0.20，β=0.15）。GFI(0.993、AGFI(0)和RMSEA(0.032)的值表明模型的适应度较高。婴儿睡眠不稳定、母亲睡眠问题、母亲刺激活动和母亲心理健康之间的相互关系在出生后仅 1 个月就得到验证。重要的是，这些关系是在新生儿时期获得的。母亲的刺激活动影响婴儿不稳定睡眠的结果对睡眠健康教育具有重要意义。