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Distribution of NREM delta activity by time of day, showing NREM slow wave activity (0.3–4 Hz) in the frontal EEG normalized to total EEG power and expressed in arbitrary units. The average of 5 animals is shown (error bars = SEM.). The arrow indicates the time of average onset of consolidated sleep. NREM delta activity (cf. Fig. 8) peaks at around 23:00 to 01:00, or 3 to 5 hours after CS onset.
