Abstract
Wakefulness, nonrapid eye movement sleep (nonREMS) and REMS of rats were scored in 4-s epochs during the first 8 h of the 12-h light period of a baseline (BL) day and during recovery (REC) from 24-h sleep deprivation (SD). Vigilance state continuity was investigated by analyzing the distribution of state episodes. After SD, state continuity was enhanced. The reduced occurrence of short wake episodes resulted in a consolidation of sleep states. The distribution of the REM-nonREM cycle length showed a mode at 10–13 min for both BL and REC. The variability of the cycle length was reduced after SD. The mean cycle length was markedly influenced by the criteria of minimum REMS episode duration and maximal allowed REMS episode interruption.
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