I'd just hole up with a game. Try and forget about it. I live in the middle of the Cannock-bloody-Chase and foxes are always finding their way into my conservatory and squirrels invading my loft. Our house is pretty old and there's ghost stories surrounding out whole estate, but nothing ever bothers me when I'm awake. When the radiators start making noises (sometimes when the water is heating up, the pipes creak and it sounds like footsteps) I just plug in my headphones and go blast some Ghouls on Fallout 3.