Table 2. Power of EEG frequency spectra in REM sleep and NREM stage 2 (means and standard deviations).

		REM		NREM stage 2
		Night 1	Night 2	Night 1	Night 2
Total	(0.1–48 Hz)	4.34±0.35	4.38±0.31	5.49±0.30	5.45±0.26
Delta1	(0.1–1.0 Hz)	3.15±0.51	3.17±0.41	4.68±0.40	4.61±0.33
Delta2	(1.0–3.5 Hz)	3.08±0.34	3.14±0.35	4.24±0.25	4.24±0.25
Theta	(3.5–8.0 Hz)	2.77±0.30	2.84±0.33	3.50±0.33	3.53±0.35
Alpha	(8–12 Hz)	1.89±0.36	1.93±0.39	2.73±0.41	2.75±0.45
Sigma1	(12–14 Hz)	0.43±0.39	0.43±0.43	1.59±0.50	1.56±0.55
Sigma2	(14–16 Hz)	0.17±0.38	0.16±0.41	0.67±0.50	0.63±0.54
Beta1	(16–24 Hz)	1.02±0.36	1.02±0.39	0.83±0.34	0.79±0.38
Beta2	(24–32 Hz)	0.00±0.54	–0.02±0.60	–0.34±0.35	–0.38±0.44
Gamma	(32–48 Hz)	–1.59±0.58	–1.62±0.62	–1.69±0.47	–1.75±0.51

REM = rapid eye movement sleep; NREM = non rapid eye movement sleep.