Fig. 9.

Effects of the PSL isolation on sleep (REMS, NREMS, EEG SWA during NREMS, Tbr) during 23-h of recording period. Measured values were averaged and depicted as means ± SE in the case of the NREMS, REMS, and the Tbr. Percent differences are represented between baseline day and sleep deprivation day values for SWA (bar graph). Solid symbols (including bars) show the PSL group values, and open symbols show the sham-operated control values. Baseline values of NREMS, REMS, and Tbr are indicated by circles, whereas triangles indicate responses to 4 h of sleep deprivation (beginning at the light onset).