The hybrid system: A mix of both sofa mechanisms, this will involve pulling, folding, or sliding a frame out to transform the sofa into a mattress. Such as, the bottom in the Posting Nordby Pep Sofa Bed slides out and much more cushions elevate to create the sofa bed area. https://health-tips82680.blogginaway.com/31636907/twin-size-loft-beds-an-overview