Effects of an advanced sleep schedule and morning short wavelength light exposure on circadian phase in young adults with late sleep schedules
Open accessAbstract
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). Methods After a baseline week, participants kept individualized, fixed, advanced 7.5-h sleep schedules for 6days. Participants were randomly assigned to groups to receive "blue" (470nm, ∼225lux, n=12) or "dim" (<1lux, n=13) light for 1h 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. Results After 6days, 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±1.1h in the dim light group and 1.4±0.7h in the blue light group. 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.
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A study in young adults (aged 21 years on average) found that bright, short-wavelength light exposure in the morning had no effect on circadian phase, as measured via melatonin rhythms.
“These data align well with a study in young adults (aged 21 years on average), which found that bright, short-wavelength light exposure in the morning had no effect on circadian phase, as measured via melatonin rhythms [172].”
From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [172]
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References 37 · Cited by 77
- Authors
- Sharkey, K. M., Carskadon, M. A., Figueiro, M. G., Zhu, Y., & Rea, M. S.
- Affiliations
- Brown University (US)
- Rensselaer Polytechnic Institute (US)
- Yale University (US)
- Corresponding author
- Sharkey, Katherine M.
- Venue
- Sleep Medicine
- Publisher
- Elsevier BV
- Published
- 2011-08
- Volume
- 12
- Issue
- 7
- Pages
- 685-692
- ISSN
- 1389-9457 (ISSN-L)
- PMC
- PMC3145013
- OpenAlex
- W1963994750
- Cited by
- 77
- References
- 37
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 5 · 2023: 2 · 2022: 9 · 2021: 5 · 2020: 4 · 2019: 4 · 2018: 7 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 10 · 2013: 12 · 2012: 5
- FWCI
- 4.00
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Sleep Medicine (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
- Funders
- National Institutes of Health
- National Institute on Drug Abuse (U01DA023822)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- delayed sleep phase syndrome, circadian phase shift, dim light exposure, dim light melatonin onset, sleep timing, young adults, light exposure
- MeSH terms
- Affect, Circadian Rhythm, Color, Dose-Response Relationship, Radiation, Female, Humans, Light, Male, Melatonin, Phototherapy, Saliva, Sleep, Stress, Psychological, Treatment Outcome, Photoperiod, Sleep Disorders, Circadian Rhythm, Young Adult
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