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Entrainment of the Circadian Clock in Humans: Mechanism and Implications for Sleep Disorders

REVIEW | Institution: Warwick Medical School, Coventry, UK

Published onMay 10, 2007
Entrainment of the Circadian Clock in Humans: Mechanism and Implications for Sleep Disorders

Abstract

Originally published January 2004.

Humans exhibit behaviour and physiology controlled by a circadian clock. The circadian period is genetically determined and administered by a series of interlocked autoregulatory feedback loops largely in the suprachiasmatic nuclei of the hypothalamus. The phase of the clock is, however, synchronised by a number of external environmental cues such as light. A failure or change in any one of the requisite clock components may result in the onset of a long-term sleep disorder. This review discusses the mechanism regulating circadian physiology in humans and explores how disturbances of this mechanism may result in sleep pathologies.

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