Effects of alternating 45-min light-dark cycles on sleep in the rat.
We studied the effect of alternating 45-min light-dark (L-D) cycles on sleep in rats. Introduction of short L-D cycles did not abolish the normal circadian rhythm of sleep-wake activity. The amount of non-REM sleep was however increased in the L and decreased in the D 45-min periods. REM was promoted in the D and inhibited in the L 45-min periods. The influence of L-D or D-L transitions depended on the sleep wake activity immediately before the transition.
Lelkes
Z
Z
Department of Physiology, Albert Szent-Györgyi Medical University, Szeged, Hungary.
Benedek
G
G
Alföldi
P
P
Hideg
J
J
D000818:Animals; D001143:Arousal / Q000502:physiology / Q000528:radiation effects; D002940:Circadian Rhythm / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D008297:Male; D010507:Periodicity; D051381:Rats; D012890:Sleep / Q000502:physiology* / Q000528:radiation effects; D012895:Sleep, REM / Q000502:physiology / Q000528:radiation effects