Power spectrum and stage analysis of sleep homeostatic response.

<p>A: Relative average EEG power density of NREM sleep during the first 6 hrs after SD. The horizontal bars indicate statistical difference (p<0.05) between SD and baseline of each group. B: Total number of wake, REM and NREM sleep bouts in the first 6 hrs after SD. C:Mean duration of wake, REM and NREM sleep in the first 6 hrs after SD. D: Changes in number of NREM sleep bouts at different ranges of episode duration in the first 6 hrs after SD. *p<0.05, **p<0.01.