audio hallucienation.....?

ok, so....last nigth about 3:00 am i woke up hot as fire.....and as i lay in the bed trying to think cool thoughts.....i swear i heard a woman....with a voice that seemed to come from the deck just below out window.....i swear i heard her say......'yes'......nothing more......i leaped from the bed to open the window to look....and saw nothing....but i couldn't go back to sleep for fear that the woman was trying to break into the house.......this morning nothing is gone.......but still these things are worrisome.....if it was true i'd be worried....and if its not, i am worried that my mind is slowly slipping away.......