The Supadupa Sofa by Alexander Lotersztain looks extremely comfy to me, and I wouldn't mind falling asleep on it. The design was inspired by beanbags and from afar, it's not hard to see the resemblance.
The Supadupa Sofa by Alexander Lotersztain has three units and can sit up to three people. The sofa itself is held together by a wood frame and has a hard foam base on the bottom. Judging from the pictures in the gallery, would you want to get one of these sofas?