I found this interesting sofa bed that reminds me of the Transformers movie. How come? You just need to look at the photo below to understand.

Sofa bed are usual for livingrooms and places to rest. But this one could transform into a bunk bed complete with a hideaway ladder and safety rail. So I can say it is a 3-in-1 bed. The Doc sofa bed is made by UK based BonBon Trading.