Ha, sorry it's not funny but I so know where you're coming from. Your house probably settles with the change of seasons or even the weather, mine does. Footsteps? That would be disturbing alright but I don't believe in ghosts, probably the floors creaking. Of course you could always jump up and sneak a look at who or whatever is lurking about. Are there ways someone could be gaining access to your house? I've heard of intruders who will merely break into a house and walk about just for the thrill - guard your drawer of panties!

Do you have a metal roof?we read stories where it was suppose to be soldiers (Ghosts) in old house attics.We heard this yes it does sound like that but its the expanding etc of metal roof???Could this be it?

Or squirrels running across the roof?

There is so many things that could be to blame. A large temp. or humidity difference between night and day might be the cause, and your flooring/woodwork/framing is just relaying the "message".