Do you let cats sleep in your bed?

I don't have any cats anymore, but when I did have a cat or cats, they usually wanted to sleep on the bed, and I don't ever remember rolling on a cat, so I am sure that they were able to move out of the way.
The favorite place for the cat to sleep seemed to be around my neck, or close to my face somewhere, and purring.
I miss the sound of a kitty happily purring on top of my ear at nite, but I don't miss having to clean the litter box every day, so just having the little dogs seems to work out better for me now.