Summary
A shift from circadian to circabidian periods or vice versa was observed in the rhythm of sleep and wakefulness under temporal isolation. The shift occurred in two subjects, 3 times in association with a single bright light pulse applied, 4 times in all. The finding suggests that the bright light pulse has an additional effect to the phase shift on the human circadian system.
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Honma, K., Honma, S. Circabidian rhythm: its appearance and disappearance in association with a bright light pulse. Experientia 44, 981–983 (1988). https://doi.org/10.1007/BF01939893
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DOI: https://doi.org/10.1007/BF01939893