Do you let cats sleep in your bed?

We always permit the cats to sleep in the bed. What I hate is when one cat sleeps in the bed and the other one looks on and looks sad, even though we offer him to also come to bed with us.

It's awful, though, when you try to move, but can't because you don't want to hurt or disturb your cat. I have to lie quite still like a rock in order not to wake up the cat(s).