Abstract
Effects of environmentally different rearing conditions upon sleep-waking parameters were studied in Long-Evans hooded rats. Male littermates were assigned to enriched (EC), standard colony (SC) and impoverished conditions (IC) at 50–60 days old and kept under each condition for 30–50 days. Polygraphic recordings revealed that the ratio of arousal time to total recording time (%Ar) decreased, and that percent slow wave sleep (%SS), percent paradoxical sleep (%PS) and mean PS duration increased significantly in EC animals compared to SC and IC groups during the night (18.00–06.00 hr). The ratio of PS to total sleep time (PS/TS) was similar in the three groups. The EC changes disappeared during the day (06.00–18.00 hr) in all items studied except for the mean PS duration. The EC-IC difference was found to be mainly due to EC and not to IC.
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