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Abstract
The EEG activity was recorded from the cortex and hippocampus in 21 rats with chronically implanted electrodes in two consecutive experiments, each lasting for seven hours.
Statistical processing of the results showed a tendency towards shortening of telencephalic sleep phases during the five hour development of sleep. No such change was found with respect to rhombencephalic sleep phases.
A positive correlation exists between the duration of the rhombencephalic sleep phases and the duration of the following telencephalic sleep phases.