Circadian phase, dynamics of subjective sleepiness and sensitivity to blue light in young adults complaining of a delayed sleep schedule

Sleep Medicine
Christophe ModerieMarie Dumont

Abstract

To assess factors that might contribute to a delayed sleep schedule in young adults with sub-clinical features of delayed sleep phase disorder. Two groups of 14 young adults (eight women) were compared: one group complaining of a delayed sleep schedule and a control group with an earlier bedtime and no complaint. For one week, each subject maintained a target bedtime reflecting their habitual sleep schedule. Subjects were then admitted to the laboratory for the assessment of circadian phase (dim light melatonin onset), subjective sleepiness, and non-visual light sensitivity. All measures were timed relative to each participant's target bedtime. Non-visual light sensitivity was evaluated using subjective sleepiness and salivary melatonin during 1.5-h exposure to blue light, starting one hour after target bedtime. Compared to control subjects, delayed subjects had a later circadian phase and a slower increase of subjective sleepiness in the late evening. There was no group difference in non-visual sensitivity to blue light, but we found a positive correlation between melatonin suppression and circadian phase within the delayed group. Our results suggest that a late circadian phase, a slow build-up of sleep need, and an increased ...Continue Reading

Citations

Jul 11, 2018·American Journal of Physical Anthropology·Gandhi YetishMichael Gurven
Mar 29, 2019·Journal of Pineal Research·David J Kennaway
Apr 14, 2020·Journal of Pineal Research·David J Kennaway
Dec 18, 2018·Frontiers in Neurology·Elise M McGlashanSean W Cain
Jun 30, 2019·Frontiers in Neuroscience·Pin-Hsuan LinYing-Lien Lin
Oct 4, 2018·The Journal of Physiology·Lauren A WatsonSean W Cain
Sep 24, 2020·Substance Abuse : Research and Treatment·Anthony A OlashoreOlaniyi O Ayilara
Sep 23, 2021·Journal of Sleep Research·Maria KormanTill Roenneberg

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