Table 2.

Sleep parameters

	Absolute time (in min)		p values	Percentage of time (in %)
	Healthy controls (mean ± SEM)	SAD (mean ± SEM)		Healthy controls (mean ± SEM)	SAD (mean ± SEM)	p values
Sleep latency	19.11 ± 3.67	15.36 ± 3.53	0.47
REM sleep latency	181.33 ± 20.57	151.77 ± 11.36	0.21
NREM sleep
N1	21.42 ± 5.57	24.80 ± 4.81	0.65	4.46 ± 1.26	4.63 ± 0.82	0.91
N2	241.22 ± 5.88	231.85 ± 13.91	0.55	48.53 ± 1.45	44.21 ± 2.55	0.16
N3	143.11 ± 13.13	166.23 ± 15.49	0.27	28.27 ± 2.00	31.47 ± 2.60	0.35
REM sleep	94.44 ± 6.43	103.64 ± 7.64	0.37	18.74 ± 1.02	19.69 ± 1.45	0.60
Total sleep time	500.19 ± 14.32	526.51 ± 14.26	0.21