Not seeing things, but I usually hear this eerie high pitched sound that sounds like it's coming from above my head, and so clear that I have to cover my ears to get to sleep. Also, a few birds live in the vent in my room, so they can usually be a pain in the ass but thats usually in the mornings. Long ago though, I heard a very clear whisper beside my head while I was in my bed. When I told my brother, he said he heard the exact same thing, coming from beside him. One of the scariest moments of my life that was.