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How to Transform a Sofa Into a Sleeper Sofa There are lots of ways to transform a sofa into a sofa bed, consisting of different mattress types. Search for one that's thick enough for comfy sleeping. Pull-out couches have a bed mattress concealed within the frame of the sofa that rolls out to produce a bed for sleeping. Some have a handle or bar to raise the bed, and some utilize a power system. 1. One-part metal action The one-part metal action sofa bed offers the best conversion mechanism and a mattress that's appro