Abstract
Sleep characteristics were investigated in ponies under normal stall conditions and during partial (visual and auditive) perceptual deprivation. Polygraphic recordings of slow waves sleep (SWS) and paradoxical sleep (PS) including changes in hippocampal activity are described. A notable feature was the modulation of rhythmic slow hippocampal activity during PS. Sleep patterns are described with a relatively short sleep cycle (mean: 13.5 min). An intermediary phase (IP), lasting about 2.0 min, frequently occurred (40%) between SWS and PS. Perceptual deprivation reduced the occurrence of IP but an increase in SWS was observed. After-effects showed an augmentation in both SWS and PS.
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