Table 3. Time spent in different Wake-Sleep states.

		BL	WD1	WD2	WD3	R1	R2
24 h
Wake		51.6±0.7	47.2±1.0 †	46.6±1.1 †	45.8±0.9 †	54.3±1.6 *	47.8±1.3 †
NREMS		41.1±0.6	45.7±1.0 †	46.6±1.1 †	48.2±1.0 †	36.6±1.5 †	43.9±1.2 †
REMS		7.3±0.3	7.1±0.2	6.8±0.3	5.9±0.3 †	9.1±0.3 †	8.3±0.3 *
Single REMS		4.1±0.2	4.0±0.3	3.8±0.4	3.8±0.3	3.5±0.4	3.6±0.3
Sequential REMS		3.3±0.3	3.1±0.3	3.0±0.4	2.2±0.3 †	5.5±0.4 †	4.7±0.3 †
12 h
Wake	L	27.1±0.6	25.8±1.5	23.9±1.1	26.8±1.5	46.9±2.4 †	30.2±1.7
	D	75.2±1.1 §	67.7±1.1 †§	68.4±1.1 †§	64.0±1.8 †§	61.5±2.5 †§	64.6±1.7 †§
NREMS	L	62.4±1.0	63.6±1.8	64.6±1.4	63.2±1.4	44.3±2.1 †	60.0±1.4
	D	20.6±0.9 §	28.7±0.8 †§	29.4±1.0 †§	33.9±1.6 †§	29.3±1.9 †§	28.5±1.7 †§
REMS	L	10.6±0.6	10.6±0.6	11.6±0.7	10.0±0.7	8.8±0.7	9.8±0.6
	D	4.2±0.5 §	3.7±0.6 §	2.2±0.2 §	2.0±0.4 §	9.2±0.9 †	6.9±0.6 *§
Single REMS	L	5.8±0.5	6.1±0.5	6.2±0.7	6.3±0.7	4.2±0.5	4.7±0.6
	D	2.4±0.3 §	2.0±0.4 §	1.4±0.3 §	1.3±0.3 §	2.9±0.4	2.6±0.3 §
Sequential REMS	L	4.7±0.4	4.5±0.6	5.3±0.8	3.7±0.5	4.7±0.6	5.1±0.6
	D	1.8±0.3 §	1.6±0.3 §	0.8±0.1 §	0.8±0.2 §	6.3±0.7 †	4.3±0.4 †

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 (*, P<0.05; †, P<0.01); D vs. L (§, P<0.05).