What a fabulous idea!

From the blog: 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. mobelform.com (via pad style)