Last night i was trying to sleep and i heard music playing,so i check outside-no cars,check computer and stereo-shut off,i asked my friend-he heres nothing,then i start hearing people talking,again im just hearing things,then im half asleep and all of a sudden i hear a bunch of screaming,intense screaming-i wake up,ask my friend again-nothing.It scared me shitless..whats wrong with me?is this normal?