I don't hear things, but I will feel breezes go by me inside my house with no reason for it. Sometimes with the feeling that something/someone is standing right behind me, or if my eyes are closed they are going to be right in front of me when I open them. I sometimes am convinced that people at work don't like me or are talking about me and the way I don't stack up, i.e, too slow, too fast, whatever. I think it all falls under that paranoia/delusional state.
I have heard things before, scary things, but I was under the influence of some hhhmmm, "mind altering" drugs, so to speak. It was scary ****.