Now this is a sofa bed. If you've ever wanted a couch that transforms into a bunk bed, you might want to check out Mobelform's Doc.

A SOFABED THAT DOES DOUBLE DUTY, Mobelform’s Doc folds out into not one, but two twin sized beds stacked one atop the other: in short, a bunk bed. Included are the necessary mattresses as well as a ladder and short rail to prevent mid-night tumbles. Note that the rail only guards one side, so Doc (and its larger, more expensive cousin, Doc XL) is best positioned with its back to the wall.

Update: more pics