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Form of sofa that converts into a bed

A sofa bed or sofa bed (in the US often called a sofabed, hide a bed, bed couch, sleeper sofa, or pullout sofa) is a multifunctional furniture typically consisting of a sofa or couch that, underneath its seating cushions, hides a metal frame and thin mattress that can be unfolded or opened up to make a bed. A western style futon differs from a sofa bed, although sofa beds using futon mattresses are common.

Leonard C. Bailey took out a patent for making the first "folding bed" on 18 July 1899. The metal bed frame was capable of being folded, bent mattress closed for use if needed. Later, it was known as a "hide a bed". Rudolf Coopersmith filed a patent for the Davenport bed in 1905. Between 1905 and 1947 Coopersmith filed over 30 patents for mechanical parts of sofa beds, mattresses and mattress manufacturing machinery. In 1925 he took out a patent for the sofa bed, the precursor of the modern day pull out sofa. William Lawrence Murphy took out a patent for making "In A Dor bed", which is known as a "Murphy bed" today. It is characterized by the folded space saver into a wall closet. In 1931, Bernard Castro made and sold the "Castro convertible" by using $400 from his savings. Castro's design is considered to be the evolution of most sofa beds sold nowadays. After mimicking the Japanese founders, the futon appeared in the United States around 1980. William Brouwer is the person who evolved the first sofa convertible frame style in the United States. A "slide away bed" can refer to a type of sofa bed that slides to the wall to form a sofa, with the mattress hinged to form a seating surface and back support. The bed frame support is a telescoping frame that allows the bed platform to recess below the seating cushion. The primitive version of the Slide Away Bed was invented by Manning Lane, Warren J. Hauck and Roy O. Sweeney of Cincinnati, Ohio. The knock down sofa bed with hinged mattress patent was filed on September 5, 1978, and issued on May 27, 1980.

Although most sofa beds use a queen short mattress measuring , other common sizes include , , and The average sofa bed mattress thickness is Sofa mattresses can be produced out of many different materials, the majority on the market being made of springs or foam.

Density is a measurement of the kilograms (or pounds) of polyurethane foam per cubic meter (or cubic foot). High density foams can be made very soft, whereas low density foams can be made very firm. Indentation force deflection (IFD) is the measure of the foam's support, representing the Newtons (or pounds of force) required to indent a foam sample by a specified percentage of its original thickness. Foam durability, flex fatigue and compression set are other terms related to foam performance.

Pocket coil mattresses are mattresses with coils resting inside the base of the mattress. Each coil is encased in its own pocket, allowing the mattress to keep its shape over time.

A slide away bed is a type of sofa bed that slides to the wall to form a sofa. The mattress is hinged to form a seating surface and back support. The bed frame support is a telescoping frame that allows the bed platform to recess below the seating cushion.

A sleeping chair, armchair bed or chair bed can differ from sleeper sofas or futons in that they are made for a one person width, which is reflected by them sometimes being referred to as single sofa bed chairs. Some sleeping chairs are multifunctional furniture that can also function as a chaise longue or recliner when upright.