anyone take it for sleep? I took it last night early like around 7. I barely got up 12 hours later and was so "hung over". The drowsiness went away after about an hour or so but man it was tough fighting going back to bed. Anyone have this experience? I have to wake up at 3 so I just took one now but also set my coffee pot to brew a cup I'm hoping to jump out of bed and sip on the coffee. Hopefully no grogginess will last.