at doses that high it is a powerful delirient/hallucinogen. from what i understand, something on the order of datura in that you have trouble telling what is a hallucination and what is not. i've heard stories of people talking to their friends who aren't present because they see them in the room with them. that type of hallucination.
I'm not taking any of that crap anymore...made me feel like crap. My sleeping tablet box said: May cause drowsines. Well, you don't say. Whatever next. Alcohol makes you drunk?
Things that say "may cause drowsiness" don't usually work on me. The best ones are the kids medications that say "may cause drowsiness or excitability in children" Great. You get a surprise.
It didn't really work on me either. Knocked me out for an hour or so...then I work up and felt like crap for...well till now, actually (I took it last night). To be fair (boring I know) I guess it is just to cover themselves against being sued.