Table 2.

Mean time spent in each sleep stage during experiment 1 (nap study)

	Stim	Sham	p Value
W	7.42% (1.85)	6.29% (1.73)	0.49
N1	20.92% (2.96)	20.92% (1.59)	0.53
N2	30.77% (4.04)	33.26% (4.19)	0.57
SWS	16.53% (2.73)	18.45% (2.03)	0.40
REM	22.57% (6.91)	21.01% (5.16)	0.78
MA	0.08% (0.08)	0.07% (0.06)	0.92
TST (mins)	83.0 (9.60)	79.3 (7.31)	0.69

Sleep during daytime nap study is characterized with the average time spent in each sleep stage (mean ± SEM). The percentage of time spent in each condition (W, wake; N1, stage 1; N2, stage 2; MA, movement artifact) was similar during the stimulation period, demonstrating that stimulation did not disrupt sleep or increase the overall time spent in non-REM sleep.