Table 1.

Time in each sleep stage and number of sounds per stage

	Wake	S1	S2	S3	REM
Time/stage (min)
Mean	27.35	6.37	27.43	26.65	3.78
SEM	3.09	0.93	2.54	2.92	1.13
Cues/stage
Mean	2.09	0.13	9.52	97.04	0.13
SEM	0.75	0.07	4.25	14.68	0.07