We are little nervous about our upcoming stay at SSR and AKV. We have 2 adults and 2 kids and several of us are going to have to sleep in the sofa bed. How comfortable are sofa beds in the DVC villas? I keep thinking back to the sofa beds of my past, where the mattress was thin and the cross rail dug into your back, making for an uncomfortable night of sleep. Should we prepare for a sleepless night? Thanks!