Buuuuut, it's now past 3am. I'm the only one awake in the house. I've had a few glasses of wine. And this house makes new and strange noises.
So I'm willing to entertain the idea of ghosts at the moment.
I heard shuffling noises behind me, had a feeling of being watched (still do, actually). So I decided to turn my webcam on so I could easily see behind me. And whoa.
I had totally convinced myself that I was being haunted by an "orb" (to the left, or my right, whatever). Turns out it was only one of those plastic things that protects the wall from doorknobs.