A couch bed is the perfect way to provide flexible sleeping space for guests, and modern sofa beds can be indistinguishable from regular couches. Shopping for a pull out sofa bed is not much different from shopping for a sofa: find the design you need that is the right size and uses the material you want. Couch beds come in a variety of sizes, from full-width sofa beds to twin, sofa beds, to even queen sized sofa beds.