a large piece of furniture often has arms, a back, and/or a headrest a foldable mattress hidden beneath a cushion or seat may have additional storage space underneath may have a fold-out mechanism to open and close the bed may have a mattress that is separate from the frame
sofabed which is a large piece of furniture sofabed which often has arms, a back, and/or a headrest sofabed which is a foldable mattress hidden beneath a cushion or seat sofabed which may have additional storage space underneath sofabed which may have a fold-out mechanism to open and close the bed sofabed which may have a mattress that is separate from the frame