Table 1.

Effects of PA on sleep onset of mice treated by subhypnotic dose of pentobarbital (28 mg/kg, i.p.)

Group	Dose (mg/kg)	No. falling asleep/total	Sleep time (min)
Control	0	8/15	30.4 ± 3.8
Muscimol	0.2	10/14***	42.9 ± 3.9*
PA	1	11/14	37.0 ± 2.3
	3	12/14	38.1 ± 3.0
	5	12/13***	79.1 ± 8.1***

Each value represents the mean (±S.E.M.) of 13–15 observations.

^*p<0 .05 and

^***p<0.005 compared to control.