Dependence of Nighttime Sleep Duration in One-month-old Infants on Alterations in Natural and Artificial Photoperiod

Overview

Journal Sci Rep

Specialty Science

Date 2017 Mar 18

PMID 28303945

Citations 7

Authors

Sachiko Iwata

Fumie Fujita

Masahiro Kinoshita

Mitsuaki Unno

Takashi Horinouchi

Seiichi Morokuma

Osuke Iwata

Affiliations

Soon will be listed here.

Abstract

Human sleep-wake cycles are entrained by both natural and artificial light-dark cycles. However, little is known regarding when and how the photoperiod changes entrain the biological clock after conception. To investigate the dependence of sleep patterns in young infants on the natural and artificial light-dark cycles, 1,302 pairs of one-month-old infants and their mothers were asked to answer a questionnaire. Birth in spring, longer daytime sleep duration, early/regular light-off times, and longer maternal nighttime sleep duration were identified as independent variables for longer infant nighttime sleep duration in both univariate and multivariate analyses. Longer maternal nighttime sleep duration was dependent on shorter naps and early/regular bed times but not on the season. We found that nighttime sleep duration depended on both natural and artificial diurnal photoperiod changes in one-month-old infants. Although sleep patterns of infants mimicked those of their mothers, nighttime sleep duration depended on the season, and was positively associated with daytime sleep duration, only in the infants. These specific variables, which render sleep patterns of the infants different from those of their mothers, might be a clue to reveal the covert acquisition process of mature circadian rhythms after birth.

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