https://old.reddit.com/r/Damnthatsinteresting/comments/w4jurp/using_augmented_reality_to_design_a_sleeping/
3 coffins? ;D
Once they port that to an iPhone app, that's going to make the visit to the dealership much much longer - the sleeping capacity of any vehicle is one of my wife's main evaluation criteria. She is morally opposed to owning a vehicle that can't be made reasonably comfortable to spend a few nights in.