[drunkinbda]

As far as i know, as long as you dont collapse and smash your head on something, you'll be ok. Others can confirm or deny this. Basically when you black out, you're body is just shutting down all non-critical functions (apparently being awake isnt biologically critical), so it can conserve oxygen for critical functions (heart beating, blood to organs, etc).

Blacking out isnt exactly "good" for you, but as far as i know you'll just wake up a few seconds later when you're body makes you breath while unconscious.