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How to Transform a Sofa Into a Sofa bed There are many ways to convert 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 hidden within the frame of the sofa that rolls out to create a bed for sleeping. Some have a handle or disallow to raise the bed, and some use a power mechanism. 1. One-part metal action The one-part metal action sofa bed provides the very best conversion system and a bed mattress that