The hybrid system: A mix of both sofa mechanisms, this will involve pulling, folding, or sliding a frame out to convert the sofa into a bed. For example, the bottom on the Posting Nordby Pep Sofa Mattress slides out and even more cushions elevate to create the sofa mattress surface. https://amazing-office-chairs27927.blogsuperapp.com/31536919/victorian-beds-no-further-a-mystery