Table 1.

The amount of NREM sleep was higher during the sleep scan session than in the awake scan session

	Awake scan session			Sleep scan session
Mean ± STD	A1	A2	EC	S1	S2	S3	S4
(%)	n = 12	n = 12	n = 13	n = 12	n = 12	n = 10	n = 10
Wake	99 ± 3	99 ± 3	68 ± 39	22 ± 19	11 ± 23	23 ± 32	22 ± 35
N1	1 ± 3	1 ± 3	28 ± 39	47 ± 25	40 ± 33	40 ± 22	35 ± 30
N2	0	0	4 ± 14	25 ± 19	46 ± 38	37 ± 29	37 ± 36
N3	0	0	0	0	1 ± 3	0	0
No REM sleep was observed.
NREM sleep (%)	1 ± 3	1 ± 3	32 ± 40	72 ± 17	87 ± 21	77 ± 30	72 ± 35

Mean ± SD (%) of the amounts of wakefulness, NREM, and total sleep times were calculated from the number of sleep-scored EEG epochs in each condition. The highest amount of sleep was achieved in S2 (mean across subjects 87%). Unknown epochs are likely because of artifacts. A₁, Awake 1 time segment, 5 min; A₂, awake 2 time segment, 5 min; EC, 5 min; S1, sleep 1 time segment, 5 min; S2, sleep 2 time segment, 5 min; S3, sleep 3 time segment, 5 min; S4, sleep 4 time segment, 5 min. The n values represent the number of a total of 15 subjects with an available EEG for sleep scoring.