The hybrid system: A mix of both sofa mechanisms, this entails pulling, folding, or sliding a frame out to transform the sofa into a mattress. Such as, the bottom in the Post Nordby Pep Sofa Mattress slides out and much more cushions carry to create the sofa bed surface area. https://multifunctionelectricshav17036.blogdon.net/loft-beds-l-shaped-options-47225524