Really? i wasnt able to pass out til like 5 am and then i would take 4 valerian and within half an hour, regardless of what time i took it, id start feeling drowzy...also helps me when im really tired, it has a paradoxical effect like that for me, if im tired and i take it, it pretty much makes it impossible to fall asleep, so it helps my fatigue quite a bit....
you also gotta watch which valerian you take, some supplements have like 300mgs a pill and recommend to take 2 pills which is nothing...the 4 i take add up to like 2120 mgs so it makes a world of difference.