Morning sunlight can phase advance the circadian rhythm of young adults

Smith, Simon S. & Trinder, John (2005) Morning sunlight can phase advance the circadian rhythm of young adults. Sleep and Biological Rhythms, 3(1), pp. 39-41.


Bright light is a know zeitgeber for the human circadian system, however, the phase shifting effects of natural sunlight are less well demonstrated. Eight male participants were exposed to 2-h periods of bright sunlight (in the morning or in the evening) over a week, following a week of restricted sunlight exposure in a repeated measures crossover design. A novel 'usual routine' methodology was used to control possible daily zeitgebers. Bright sunlight in the morning induced an advance of the acrophase of the body temperature rhythm. This study supports the salience of sunlight as an everyday zeitgeber under naturalistic conditions.

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2 citations in Scopus
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ID Code: 15678
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.
Additional URLs:
Keywords: human circadian rhythm, sunlight, zeitgeber
ISSN: 1446-9235
Subjects: Australian and New Zealand Standard Research Classification > PSYCHOLOGY AND COGNITIVE SCIENCES (170000) > PSYCHOLOGY (170100) > Sensory Processes Perception and Performance (170112)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Copyright Owner: Copyright 2005 Blackwell Publishing
Deposited On: 21 Nov 2008 00:00
Last Modified: 29 Feb 2012 14:12

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