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Association between delayed bedtime and sleep-related problems among community-dwelling 2-year-old children in Japan

Shingo Kitamura, Minori Enomoto, Yuichi Kamei

    Journal of Physiological Anthropology
    |April 11, 2015
    PubMed

    Insights

    Delayed bedtime in 2-year-olds is linked to significant sleep problems, including irregular schedules and difficulty sleeping. This "night owl" tendency in early childhood warrants attention for potential health implications.

    Area of Science:

    • Pediatric Sleep Medicine
    • Developmental Psychology
    • Chronobiology

    Background:

    • Delayed sleep timing in adults is associated with numerous health issues.
    • Limited data exists on the clinical significance of a
    • night owl
    • lifestyle in early childhood.
    • This study investigates sleep patterns in young children.

    Purpose of the Study:

    • To examine the association between habitual delayed bedtime and sleep-related problems in 2-year-old children.
    • To understand the prevalence and nature of sleep disturbances in toddlers with late bedtimes.

    Main Methods:

    • A questionnaire-based study involving parents/caregivers of 708 community-dwelling 2-year-olds in Japan.
    • Data collected on sleep habits and sleep-related problems over the past month.
    • Analysis of complete data from 425 children.

    Main Results:

    • 21.2% of children had a bedtime of 22:00 or later.
    • Delayed bedtime was significantly associated with irregular bedtime, delayed wake time, shorter total sleep time, and sleep initiation/termination difficulties.
    • Delayed bedtime correlated with bedtime resistance and morning problems, even after adjusting for sleep duration.

    Conclusions:

    • Delayed bedtime in 2-year-olds is linked to various sleep-related problems.
    • Potential contributing factors include reduced homeostatic sleep drive and biological clock-regulated diurnal preference.
    • Early identification and intervention for delayed sleep timing in toddlers may be crucial.
    Abstract

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