Abstract
Summary Twenty-four male albino rats were reared in matched pairs, in two different environments from weaning age. Half were in an enriched condition and the rest were isolated in individual cages. After 3 weeks, all animals were chronically implanted with electrodes for recording EOG, EEG and EMG, and after 1–2 weeks recovery, two 23 h recordings were made from each rat, in their matched pairs. (1) The enriched rats had significantly more slow wave sleep time and REM sleep time, but their percentage REM sleep was not greater. (2) After 80 days, 5 isolated rats were transferred to the enriched environments, and recorded again 16 days later. Their slow wave sleep increased by 15.0% and REM sleep by 7.2%. Rats reared in these enriched conditions have previously been reported to have increased total brain weights, and the results of this study are interpreted with special reference to sleep as a time of synthesis of brain macromolecules.
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