Abstract
Ss undergoing four-day dark, quiet sensory deprivation (SD) showed more restlessness and life-sustaining activity during the day than at night. These results contrast with retrospective reports of disrupted diurnal cycles. Daytime restlessness increased over days. Day 2 daytime restlessness predicted later requests for release and, among early release (ER) Ss, correlated inversely with time in isolation. ER Ss were more restless the hour before termination than were all other Ss during that hour.
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