When I started taking it, it would knock me out as well. Not physically pass out but once I was sleeping I would not wake up. The first time I took it, I slept for 16hrs straight. The nights that I take it I don't even hear my son waking up. Therefor I make sure my hubby is home and only take it at night before bed. It is getting better though, it seems to be less everytime and I've been on it for just over 2mnths.