Table 3.

Minutes (M ± SD) spent in sleep stages.

Group (n)	Sleep stage
	S1	S2	SWS	REM	TSTa	Wake
s_inc+ (19)	33.03 ± 22.31	41.10 ± 20.56	37.13 ± 22.36	10.13 ± 12.86	121.39 ± 27.75	28.58 ± 27.70
s_inc- (17)	29.44 ± 22.29	36.79 ± 20.48	50.32 ± 27.27	16.67 ± 14.06	133.24 ± 21.93	18.88 ± 17.94

^aTST, total sleep time.