[Taera]

I see.

Well, if you believe in it, cats are amongst the few animals that have direct contact with the spirit world - they can see all the spiritual things that happen in your home. I can give you several things about their behavior that can help you.
Either way, if this disturbs you, get a priest or a medium -- one you believe is true -- to look over your apartment or house.

This is, if you believe in such stuff. I also remember hearing of some ways to get rid of spirits (i was kinda interested in that several years ago) so i can try to remember if you want. i can also ask somebody.