Anytime I feel like I'm shifting into my old habit of going to sleep too late I take 2 pills, and in 30-40 minutes I'm gone. It's an amazing supplement. I use it when I feel panicky or sad, about-to-have-a-meltdown type of mood, it doesn't make me sleepy then, but it really really calms me down, especially when taken during the day (1 pill).
But I wouldn't suggest taking it if you might have to drive, because it might make you a little bit too relaxed.
It helps with anxiety too.