it really depends on dosage, each person, & the brand..

there are so many, ive found that the source naturals works, the sublingual. after long use i started getting weird dreams & hot flash/night terror, waking up alot, so ive just been taking valerian lately..

I also use it after trips, trying to sleep/recover off drugs like extacy or cocaine.

ive tryed the new all natural melatonin it was ok, i just got the travel pack so idk..

i tryed a walmart brand naturol or something it sucked, & a couple other brands that i tryed at wild oats sucked, i think it was a 3mg time release..

the dosages are pretty iffy.. but its an interesting chemical for dreaming.