The hybrid system: A mix of each sofa mechanisms, this includes pulling, folding, or sliding a frame out to convert the sofa into a bed. One example is, the bottom from the Posting Nordby Pep Sofa Mattress slides out and even more cushions raise to create the sofa mattress area. https://how-to-make-wine-from-gra64296.thenerdsblog.com/36677463/the-fact-about-best-platform-beds-that-no-one-is-suggesting