I take this fairly often when I have fallen behind on my sleep and can commit a full 8 hours or more before I need to get up and start moving. I am allergic to Ambien, and none of the other more holistic routes works for me (warm bath, tea, melatonin, mediation, music, etc.). Simply Sleep DOES work for me, but I have to take both pills in the dose, not half. What I have noticed is that when I take it and don't go to bed for more than an hour afterwards, when I do lay down, my lower legs lose some feeling. This, then, causes me difficulty in getting to sleep. Best case I have is to take it, then go to bed within half an hour. Pretty much exactly what it says on the box. It does not put me out for the whole night, but I can get back to sleep easier than I do without it.