In 1940, Simmons introduced the Hide-A-Bed, a sofa that incorporates a fold-out spring and mattress that pull out to form a bed. This was to become one of the company's best known products and was manufactured until the 1980s. During World War II, Simmons' facilities were diverted to military production, making cots, parachutes, bazooka rockets and other products. By the post-war year of 1947, the company was back in the mattress business and started using advertising to associate its products with the Hollywood glamor of actresses including Dorothy Lamour and Maureen O'Hara. A research and development facility was established in Munster, Indiana, in 1957, building upon pioneering studies on human sleep behavior that Simmons had sponsored in the 1930s. In 1958, the company became the first U.S. mattress maker to produce mattresses in king and queen sizes, an innovation that was promoted as solving the "space battle in the bedroom".