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.
mobelform.com[From mobelform doc sofabed]