What is the definition of a sofa bed, and does a futon qualify as one?
A sofa bed is a couch, with a hidden pull-out mattress, that converts into a bed; and a futon is a foldable frame with a mattress that lays flat to become a bed.
Sofa beds typically have a metal frame and thin mattress stored inside the sofa that can be pulled out to create a sleeping space, making them a popular space-saving furniture solution for guest accommodations in limited spaces.
Futons generally feature a single foldable mattress on a wooden or metal frame, with the backrest folding down flat to convert from a couch to a bed; futon mattresses are usually thinner than standard mattresses and often made of cotton, foam, or a combination, allowing for easy transition between seating and sleeping.