Cats sleep most of the day, and they usually find a cozy spot to sleep. It may be your bed, favorite chair, stack of papers and books, fresh pile of linen, on top of a piece of furniture, or in an isolated corner.
For my cat Mittens, those were all preferred spots at one time or the other, that is until I got her a cat basket. I placed it in her favorite corner, added an old towel for cushioning, and at first she ignored it. So two days later I added her favorite toy to the cat basket, watched from afar, and waited patiently. As curious as a cat, as the saying goes, she stepped in the basket and got hooked. Since that day it has been her preferred, cozy spot.