Ohh!! If you haven't seen it, rent 'In Dreams' with Annette Benning and Robert Downey Jr. God, that movie creeped me out!! The cover of the DVD still gives me the willies.
Another little-known but very awesome horror/thriller - 'Session 9.' Set in an insane asylum, now vacant, and scheduled for asbestos removal. They find a lot more than asbestos...
These two should keep you up tonight.