Core77 had an awesome post about this bed (via Freshome) and while I usually try not to use link-to-link-to-link-to-link articles, I couldn't resist this one.
The Doc Sofa:
A sofa with removable covers and integrated/patented mechanism which transforms the sofa into a bunk bed. Doc XL furnishes the day area and with a simple movement transforms into a practical ready made bunk bed with integrated supporting ladder and protection guard.
