Impacts of Circadian Rhythm in Mothers from Pregnancy to Postpartum period on the Maternal and her Infants' Health

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The purpose of this study was to clarify the Impacts of sleep-wake rhythm and life habits in mothers from pregnancy to postpartum period on the maternal health and on her infants' circadian rhythm.Participants were 60 women in late pregnancy to postpartum four month. Fifty seven mothers after 35 week of pregnancy gave informed consent, were the subjects. Out of these, fifty three in 1 month postpartum and 41 in 4 month after delivery were longitudinal surveyed.Participants recorded sleep-and-wakefulness by day-by-day plot method on Sleep log for a week, activity rhythm using Actigraphy, collected own saliva to measure melatonin rhythm concurrently, and filled questionnaire of PSQI and daily rhythm. Their infants were also recorded same sleep log, actigraphy, and collected saliva by the mothers in postnatal 1 and 4 month.As results, quality of sleep in pregnant women changed to worse. Although the longest sustained sleep period (LSP) in postpartum mother was divided shorter, the sleep period was 24-hr. It was found that early bed time in women could prolong the LSP from pregnancy to postpartum period. Nocturnal sleep in infants, whose mothers went to bed earlier in late pregnancy, became longer in postnatal 1 month. This suggests that of circadian sleep-wake rhythm in pregnant women facilitates development of the rhythm in human fetus too in uterus. Regular sleep-wake habits in pregnant women would be significant for prevention of disease related to life habit in maternal and infants health. We will elucidate remained hypotheses, because little participants with pregnant complication took place in this study.