Effects of an advanced sleep schedule and morning short wavelength light exposure on circadian phase in young adults with late sleep schedules
Date
2011
Authors
Sharkey, K.M.
Carskadon, M.A.
Figueiro, M.G.
Zhu, Y.
Rea, M.S.
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Journal article
Citation
Sleep Medicine, 2011; 12(7):685-692
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Abstract
Conclusions: Adherence to a fixed advanced sleep/wake schedule resulted in significant circadian phase shifts in young adults with subclinical DSPD with or without morning blue light exposure. Light/dark exposures associated with fixed early sleep schedules are sufficient to advance circadian phase in young adults.
Methods: After a baseline week, participants kept individualized, fixed, advanced 7.5-h sleep schedules for 6 days. Participants were randomly assigned to groups to receive ''blue'' (470 nm, ~225 lux, n = 12) or ''dim'' (<1 lux, n = 13) light for 1 h after waking each day. Head-worn ''Daysimeters'' measured light exposure; actigraphs and sleep diaries confirmed schedule compliance. Salivary dim light melatonin onset (DLMO), self-reported sleep, and mood were examined with 2 X 2 ANOVA.
Objective: We examined the effects of an advanced sleep/wake schedule and morning short wavelength (blue) light in 25 adults (mean age ± SD = 21.8 ± 3 years; 13 women) with late sleep schedules and subclinical features of delayed sleep phase disorder (DSPD).
Results: After 6 days, both groups showed significant circadian phase advances, but morning blue light was not associated with larger phase shifts than dim-light exposure. The average DLMO advances (mean ± SD) were 1.5 ± 1.1 h in the dim light group and 1.4 ± 0.7 h in the blue light group.
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Link to a related website: http://europepmc.org/articles/pmc3145013?pdf=render, Open Access via Unpaywall
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Copyright 2011 Elsevier B.V.