Power density in the different band of the EEG during the different Wake-Sleep states.

<p>Relative levels of power density in the delta (0.75–4.0 Hz; DPW) band of the EEG during non-rapid eye movement sleep (NREMS) and in the theta (5.5–9.0 Hz, TPW) band of the EEG during either Wake or rapid eye movement sleep (REMS) in rats (n = 8) under normal laboratory conditions (average of two days of baseline, BL), during a three-day water deprivation protocol (WD1, WD2, WD3), and in the two days of recovery (R1, R2) which followed the reestablishment of the access to water. Values (means ± S.E.M.) for the 12-h Light (L) and the 12-h Dark (D) periods are shown and expressed as the percent of the mean 24-h level of the BL. Statistically significant comparisons are shown: treatment <i>vs</i>. BL (*, P<0.05; †, P<0.01); D <i>vs</i>. L (§, P<0.05).