Time spent in different Wake-Sleep states.

Time spent in the different Wake-Sleep states (Wake; NREMS, non-rapid eye movement sleep; REMS, rapid eye movement sleep) 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 whole 24-h period or for the 12-h Light (L) and the 12-h Dark (D) periods are shown and expressed as the percent fraction of the 24-h or the 12-h period. Statistically significant comparisons are shown: treatment vs. BL (*, Pvs. L (§, P