The only daybeds I have used are almost like couches. They are part of the room, not a hide-a-bed. There are sleep sofas in the DVC villas where the mattress folds into the couch. Not the same thing as a daybed.
In the Fort Wilderness cabins, the living room has a hide-a-bed, sort of. They call it a Murphy bed, and it is a double bed on a platform that lifts up into the wall. The platform has artwork, so when it isn't used, it looks like part of the wall. More comfy than a sleep sofa.