I have been off and on zzquil since my sophomore year in high school and now I'm a sophomore in college I switched over to unisom several months ago starting with one pill to knock me out but now I'm up to 4 pills (200 mg)a night , it takes roughly 2 hours for it to kick in. I read the symptoms of sleep aid overdose and I show that I may be delirious ( i dream and my eyes are closed but I'm not fully asleep), I can move but my body doesn't want to move, and I get cotton mouth when I take it, I don't feel addicted to it like I am with tobacco but I know if I want to sleep well and wake up feeling wide awake and not cursing my alarm I take the unisom, do the pills harm my body more than they help it?