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The total number of transitions between stages during the 8 h recording period in Sprague-Dawley (SD) and OR rats. Both groups of rats had significantly higher transitions between stages during sleep deprivation (PSD). Results are expressed as means ± S.E.M. N=6/group. **P < 0.01 compared to respective controls. πP < 0.001 as compared to SD rats during the control recording condition.
