Do your dogs sleep in your bed with you?

They don't sleep in my bed because I shut the door, but one of my dogs sleeps in my mothers bed, but not under the covers. The other one doesn't do it because he can't go up the stairs to the bedrooms, but he sleeps in the sofa instead. I don't really like the idea of them sleeping on the sofa, but they only go there when everybody is asleep and I can't shut them in the kitchen because they will scratch the door, and don't like leaving them outside in the cold.