title: Constant light suppresses sleep and circadian rhythms in pigeons without consequent sleep rebound in darkness.
abstract: Sleep patterns and circadian rhythms of body temperature, activity, body weight, and electroencephalographic (EEG) power spectra of pigeons were compared among three photic conditions: a 12:12-h light-dark cycle (LD), followed successively by constant bright (LL) and dim light (DD) periods. LL suppressed non-rapid-eye-movement and rapid eye movement sleep and circadian rhythms of the measured variables without producing increased drowsiness or other physiological or behavioral changes. Sleep patterns after LL-DD transitions also showed no evidence of prior sleep deprivation during LL. Sleep latency after LL-DD transitions was 93 min longer than after L-D transitions in LD. Total sleep and EEG slow wave activity during the first 24 h in DD did not differ from D in LD. Free-running circadian rhythms subsequently reappeared in DD after LL.
authors.affiliation: Department of Biology, Sinsheimer Laboratories, University of California, Santa Cruz 95064.
authors.forename: R J
authors.initials: RJ
authors.lastname: Berger
authors.forename: N H
authors.initials: NH
authors.lastname: Phillips
mesh_terms: D000818:Animals; D001831:Body Temperature; D002940:Circadian Rhythm / Q000528:radiation effects; D010856:Columbidae / Q000502:physiology*; D003624:Darkness; D004594:Electrophysiology / Q000379:methods; D006706:Homeostasis; D008027:Light; D008297:Male; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages; D012895:Sleep, REM; D013995:Time; D014851:Wakefulness