yo i've definitely had this shit happen to me. however, i don't call it sleep paralysis because it only happened at my girls old house. I call it "shadow dude scaring the fuck out of me and disappearing into the wall." shit is so creepy, only after real awful nightmares too (and my nightmares are already pretty fucking bad). I always got the feeling that this thing was causing the nightmare, rather than vice-versa. I'm superstitious though..