Howling:The Doctor's room in the Tardis

At the end of The Doctor's Wife. Rory, Amy and the Doctor are talking about accomodation in the Tardis and Rory asks, "Doctor, do you have a room?" The Doctor doesn't answer. It's a bizarre piece of dialogue that seems to serve no plot or character development point, unless it's foreshadowing some day soon when we get to see the Doctor's in pyjamas sleeping in a sensory deprivation chamber.