Publication

Linking light exposure and subsequent sleep: A field polysomnography study in humans

Wams, E. J., Woelders, T., Marring, I., van Rosmalen, L., Beersma, D. G. M., Gordijn, M. C. M. & Hut, R. A., Dec-2017, In : Sleep. 40, 12, zsx165.

Research output: Contribution to journalArticleAcademicpeer-review

Copy link to clipboard

Documents

DOI

Study objectives: To determine the effect of light exposure on subsequent sleep characteristics under ambulatory field conditions.

Methods: Twenty healthy participants were fitted with ambulatory PSG and wrist-actigraphs to assess light exposure, rest-activity, sleep quality, timing and architecture. Laboratory salivary dim-light melatonin onset (DLMO) was analyzed to determine endogenous circadian phase.

Results: Later circadian clock phase was associated with lower intensity (R2=0.34, χ2(1)=7.19, p <0.01), later light exposure (quadratic, controlling for daylength, R2=0.47, χ2(3)=32.38, p <0.0001), and to later sleep timing (R2=0.71, χ2(1)=20.39, p<0.0001). Those with later first exposure to more than 10 lux of light had more awakenings during subsequent sleep (controlled for daylength, R2=0.36, χ2(2)=8.66, p<0.05). Those with later light exposure subsequently had a shorter latency to first REM sleep episode (R2=0.21, χ2(1)=5.77, p<0.05). Those with less light exposure subsequently had a higher percentage of REM sleep (R2=0.43, χ2(2)=13.90, p<0.001) in a clock phase modulated manner. Slow wave sleep accumulation was observed to be larger after preceding exposure to high maximal intensity and early first light exposure (p<0.05).

Conclusions: The quality and architecture of sleep is associated with preceding light exposure. We propose that light exposure timing and intensity does not only modulate circadian-driven aspects of sleep but also homeostatic sleep pressure. These novel ambulatory PSG findings are the first to highlight the direct relationship between light and subsequent sleep, combining knowledge of homeostatic and circadian regulation of sleep by light. Upon confirmation by interventional studies, this hypothesis could change current understanding of sleep regulation and its relationship to prior light exposure.

Original languageEnglish
Article numberzsx165
JournalSleep
Volume40
Issue number12
Early online date12-Oct-2017
Publication statusPublished - Dec-2017

    Keywords

  • Journal Article, QUALITY, WORKERS, RETINAL GANGLION-CELLS, CIRCADIAN TIMING SYSTEM, PHASE, ENTRAINMENT, MELATONIN, CHRONOTYPE, RESPONSES, RHYTHMS
Related Press / Media
  1. Exposure to sunlight improves sleep quality

    Roelof Hut & Emma Wams

    17/10/201722/10/2017

    6 items of Media coverage

    Press/Media: ResearchAcademic

View all (1) »

Download statistics

No data available

ID: 49657910