sofa bed

A sofa bed or sofa-bed, (in the US often sofabed, hide-a-bed, bed-couch or sleeper-sofa), typically is a sofa or couch which has underneath its seating cushions a metal frame and thin mattress that can be unfolded or opened up to make a bed. A futon differs from a sofabed, although sofa beds using futon mattresses are common.