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.