Daily Profiles of Light Exposure and Evening Use of Light-emitting Devices in Young Adults Complaining of a Delayed Sleep Schedule

Journal of Biological Rhythms
Solenne Van der MarenMarie Dumont

Abstract

A number of factors can contribute to a delayed sleep schedule. An important factor could be a daily profile of light exposure favoring a later circadian phase. This study aimed to compare light exposure between 14 young adults complaining of a delayed sleep schedule and 14 matched controls and to identify possible associations between habitual light exposure and circadian phase. Exposure to white and blue light was recorded with ambulatory monitors for 7 consecutive days. Participants also noted their daily use of light-emitting devices before bedtime. Endogenous circadian phase was estimated with the dim light melatonin onset (DLMO) in the laboratory. The amplitude of the light-dark cycle to which the subjects were exposed was smaller in delayed than in control subjects, and smaller amplitude was associated with a later DLMO. Smaller amplitude was due to both decreased exposure in the daytime and increased exposure at night. Total exposure to blue light, but not to white light, was lower in delayed subjects, possibly due to lower exposure to blue-rich outdoor light. Lower daily exposure to blue light was associated with a later DLMO. Timing of relative increases and decreases of light exposure in relation to endogenous circad...Continue Reading

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Citations

Oct 4, 2018·The Journal of Physiology·Lauren A WatsonSean W Cain
Dec 12, 2019·Neural Regeneration Research·Fang XingTian-Jiao Xia
Feb 15, 2021·Sleep·Jeanne F DuffyElizabeth B Klerman
Feb 9, 2021·Journal of the American Academy of Child and Adolescent Psychiatry·Martijn ArnsAndrew N Coogan

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