A couple of years ago I went to a Renaissance Faire in NY State, and stayed over night with my cousins. They lived in an apartment in part of an old house near Ithaca. Since it was an apartment, I got to sleep on the sofa in the living room. I should mention that I'm rather sensitive to atmosphere, but even though I'd been in that room several times, I'd never felt anything odd there before. Well, I fell asleep all right, but in the middle of the night I woke up with a start. I heard a sort of rustling, like someone flipping through the pages of a book, right underneath the window. I remember thinking, "What is that cat doing?" It was quite loud and repeated once, the stopped completely. I was half-asleep (but not fully asleep!) at the time, so I just turned over and went back to sleep. It wasn't till I woke up in the morning that I remembered my cousins don't have any pets. When I mentioned it to my cousin, she just nodded and said they thought that one of the previous occupants hadn't quite left.