Ive been KO'ed once. Honestly, I didn't hurt a bit. To me it felt like some one throwing a basketball at your head (if you have ever had that happen). I blacked out for a second, but it wasn't painful like if you got punched in a muscle.

I ending up getting a concusion. Got an MRI. Doc told me, 9 times outta 10 a concussion with a boxing glove will not cause severe damage.

oh, and that whole "YOU CANT FALL ASLEEP IF YOU HAVE A CONCUSSION" thing, its a myth.