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Outdoor night light exposure and sleep patterns measured with wearable devices
Updated
Abstract
Essence
Outdoor was linked to tiny shifts in wearable-measured sleep, including slightly longer light sleep and possible deep-sleep decline at higher exposure.
Evidence
This panel study analyzed 4,690 Chinese participants from 2017 to 2019 using Zepp bracelet sleep data, NASA Black Marble nighttime light exposure, and mixed-effects regression models.
Caveat
The associations were small, partly subgroup- and spline-dependent, and outdoor light exposure does not capture indoor light or individual sleep behaviors.
Simplified
Key numbers
1.22 min
Increase in Light Sleep Duration
Per 1 standard deviation increase in exposure.
4.41 min
Elderly Light Sleep Increase
For participants aged ≥ 65 years.
0.10 min
Deep Sleep Duration Change
In the mixed-effects regression analysis.