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Effects of alternating 45-min light-dark cycles on sleep in the rat
Z Lelkes1, G Benedek, P Alföldi
1Department of Physiology, Albert Szent-Györgyi Medical University, Szeged, Hungary.
Acta Physiologica Hungarica
|January 1, 1990
Abstract:
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.