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A free-running circadian sleep–wake cycle 25.3 hours in duration. Despite living in an unchanging ...

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A free-running circadian sleep–wake cycle 25.3 hours in duration. Despite living in an unchanging environment with no time cues, the man went to sleep each day approximately 1.3 hours later than he had the day before. (Based on Wever, R. A. [1979]. The circadian system of man. Seewiesen-Andechs, Germany: Max-Planck-Institut für Verhaltensphysiologie.)
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