The hybrid system: A combination of both equally sofa mechanisms, this consists of pulling, folding, or sliding a frame out to transform the sofa into a bed. For example, the bottom on the Posting Nordby Pep Sofa Bed slides out and more cushions elevate to create the sofa mattress area. https://2188322.bloggip.com/31089641/victorian-beds-no-further-a-mystery