The effect of ginsenosides on the sleep onset of mice treated with sub-hypnotic dose of sodium pentobarbital. *p < 0.05, **p < 0.01, ***p < 0.001 vs. vehicle group, chi-square test.

Group	Dosage (mg kg−1)	No. of falling asleep/total	Sleep onset (%)
Vehicle	—	0/10	0
LPD	64	4/10	40
HPD	96	6/10	60*
LPT	64	7/10	70**
HPT	96	8/10	80**
DZP	2	10/10	100***