کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3177062 | 1200288 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effects of an advanced sleep schedule and morning short wavelength light exposure on circadian phase in young adults with late sleep schedules Effects of an advanced sleep schedule and morning short wavelength light exposure on circadian phase in young adults with late sleep schedules](/preview/png/3177062.png)
ObjectiveWe 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).MethodsAfter 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 × 2 ANOVA.ResultsAfter 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.ConclusionsAdherence 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.
Journal: Sleep Medicine - Volume 12, Issue 7, August 2011, Pages 685–692