The Ultimate Guide to Sofa Beds: Sleeper Sofas, Futons, and MoreThe Indispensable Double-Agent: A Time-Honoured Salute to the Sofa BedIn the annals of domestic utility, few pieces of furniture command such universal respect and necessity as the humble, yet endlessly clever, Sofa Bed. It is the perfect double-agent of the drawing-room, a virtuoso of