I was speaking with a friend the other night that wants to downsize her Sleep Number King bed to make more room in her bedroom. She likes the size of the Queen but said it would reduce her sleep area 10". Don't they make SN Queen beds for single sleepers? Or, do you have to adjust both sides to sleep in the middle? Her thinking seems to be that you must sleep on one side of the mattress. We don't have a SN so I'm clueless.