Coolest hide-a-bed ever! Sofa beds are great with their versatile functions. But even the best sofa bed has to bow down to this: the Doc Space Saving System, which converts from a regular couch to a two-level bunk bed.
Sofa bed / pull-out bed in the out position for sleeping. Not detailed instructions, but gives photos of the process. This one is small for a camper van, but could make a large version for living room.