Walther Greer

A Bed For The Feline: Felines will sleep anywhere that is warm and comfy. Ideally soft too! This is the simplest training aid to supply as an old pillow or even a blanket will do as long as it remains in a warm area. Also make it interesting the cat

Many cats show a preference for a particular type of litter. If he has stopped using the little box after you changed the litter you use, your cat is telling you that he liked the old one better. Try changing back to your previous brand, it may be just that