I was thinking maybe you had a hair in your ear that was rubbing the eardrum. I was pretty sure you weren't hallucinating because you seemed too rational. One night while sleeping I heard the strangest "voice" and put my ear to the window to see if there was anyone outside with walkie talkies or something. I thought "I'm too old to suddenly develop schizophrenia". Then I put my ear to my wall to see if my neighbors were talking (I lived in an apt. at the time). I didn't hear anything so I laid back down. Then I heard it again. It was my stomach grumbling from too much advil. I couldn't feel it; only heard it. Sanity is good