Effects of an eight-hour advance of the light-dark cycle on sleep-wake rhythm in the rat.
We observed effects of an 8-h advance of the light-dark (LD) cycle on the sleep-wake rhythm in the rat. On the day phase-advanced, rapid eye movement (REM) sleep increased with its enhanced diurnal amplitude. Non-REM (NREM) sleep gradually increased in parallel with the decrease of its diurnal amplitude. Although the acrophase of NREM sleep gradually advanced after the phase advance, that of REM sleep did not significantly change. We confirmed that diurnal rhythm of REM sleep was hardly shifted and dissociated from the rhythm of NREM sleep under the eight-hour advance of the LD cycle in the rat.
Sei
H
H
Department of Physiology, School of Medicine, University of Tokushima, Japan.
Kiuchi
T
T
Chang
H Y
HY
Morita
Y
Y
D000818:Animals; D002940:Circadian Rhythm / Q000502:physiology; D003624:Darkness; D008027:Light; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012890:Sleep / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology; D014851:Wakefulness / Q000502:physiology*