Linking Light Exposure and Subsequent Sleep: A Field Polysomnography Study in Humans.

ABSTRACT: To determine the effect of light exposure on subsequent sleep characteristics under ambulatory field conditions. Twenty healthy participants were fitted with ambulatory polysomnography (PSG) and wrist-actigraphs to assess light exposure, rest-activity, sleep quality, timing, and architecture. Laboratory salivary dim-light melatonin onset was analyzed to determine endogenous circadian phase. Later circadian clock phase was associated with lower intensity (R2 = 0.34, χ2(1) = 7.19, p < .01), later light exposure (quadratic, controlling for daylength, R2 = 0.47, χ2(3) = 32.38, p < .0001), and to later sleep timing (R2 = 0.71, χ2(1) = 20.39, p < .0001). Those with later first exposure to more than 10 lux of light had more awakenings during subsequent sleep (controlled for daylength, R2 = 0.36,

SUBMITTER: Wams EJ 

PROVIDER: S-EPMC5806586 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature