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Insufficient Sleep and Sleep Deprivation01:13

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  11. Outdoor Night Light Exposure And Sleep Structure, A Panel Study Using Consumer-grade Wearables

Outdoor night light exposure and sleep structure, a panel study using consumer-grade wearables

Huining Yang1, Jiajun Liu2, Yunzhe Chen2

  • 1Department of Disease Prevention and Control, Third Medical Center, General Hospital of the People's Liberation Army, Beijing, China.

BMC Public Health
|January 6, 2026

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View abstract on PubMed

Summary
This summary is machine-generated.

Artificial light at night (ALAN) was linked to longer light sleep. Higher nighttime light (NTL) levels may reduce deep sleep, impacting circadian rhythms and sleep quality.

Area of Science:

  • Environmental Health
  • Sleep Science
  • Public Health

Background:

  • Artificial light at night (ALAN) is a growing public health concern.
  • ALAN can disrupt circadian rhythms and negatively impact sleep quality.
  • This study investigates the link between outdoor nighttime light (NTL) and sleep duration.

Purpose of the Study:

  • To examine the association between outdoor NTL exposure and objectively measured sleep duration.
  • To identify potential demographic or behavioral factors influencing this association.
  • To inform urban lighting guidelines for better sleep health.

Main Methods:

  • Utilized wearable device data (Zepp Health smart bracelets) from 4,690 Chinese participants (2017-2019).
  • Assessed outdoor NTL exposure using NASA's Black Marble product.
Keywords:
Nighttime lightOutdoor lightSleep durationSleep quality

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  • Employed mixed-effects regression models, adjusting for covariates, to analyze NTL and sleep metrics.

    • Main Results:

    • Increased NTL exposure correlated with a slight increase in light sleep duration (1.22 min per SD increase).
    • No significant linear association was found between NTL and total or deep sleep duration.
    • Subgroup analyses indicated stronger associations in the elderly, lower BMI, non-drinkers, smokers, and those in lower-income areas.

    Conclusions:

    • Moderate NTL levels may slightly increase light sleep, while higher levels might reduce deep sleep.
    • Findings highlight the need for urban lighting policies balancing safety and sleep health.
    • Emphasizes the importance of considering individual sleep behaviors and indoor light exposure in future research.
    Wearable device