Table IV.

Comparisons of sleep parameters between the E-AED I and E-AED II groups.

Parameters	E-AED I group	E-AED II group	P-value
NREM phase 1 (min)	29.50±10.61	92.10±48.24	<0.05
REM phase (min)	116.99±12.90	70.82±17.69	<0.05
Sleep efficiency (min)	91.96±3.14	89.39±2.55	<0.05
Times the patient awoke (n)	2.40±1.39	7.25±2.86	<0.05
Periods of REM (n)	4.45±0.999	3.60±0.995	<0.05

Data are expressed as the mean ± SD. E-AED I, duration of VPA administration <3 months; E-AED II, duration of VPA administration >3 months; VPA, sodium valproate; NREM, non-rapid eye movement; REM, rapid eye movement.