Perhaps, if one was so scared of the fact that they were awake but they can't move (sleep paralysis) or anything else one might experience while being in that state, then maybe one could possibly have a heart attack and die. Especially, those that have never experienced being in that state before (I'm not trying to scare anyone, it is just a thought). If you or anyone else finds themselves in this state, just attempt to move like a finger, then your hand, then your arm and so on to break free from the paralysis. If one wants, they can take advantage of the paralysis and go out-of-body by simply doing an exit technique.