Mine sleep wherever they please. During the day, they'll sleep various places, sofa, our bed, spare bed, behind the drapes, on the side of the bed, etc. At night they often sleep in our room, sometimes Swanie will sleep on the dresser, sometimes on the floor on DH's dirty clothes pile, or on our bed. Cindy will sleep on the floor next to the bed, in the hallway by the stairs, or on our bed. This morning Swanie decided to get on our bed. So, he started up around my waist trying to find a solid enough surface that he could get to the middle between DH and I. He finally found one down around my knees (I was on my side). That was loads of fun (he is a BIG boy). Then about half an hour later, he came up behind my head on my pillow, and started messing in my hair like he does sometimes.
I've found they sleep on our bed more often in the winter than in the summer. Sometimes I would wake up with Cindy sleeping on my side. Fortunately, she's a petite little sweeting.