Abstract: A bed, comprising a frame having at least two side parts between which there is provided a space for a lying surface of constant area for a person to repose. In order to be able to cover the space with the lying surface when the bed is not in use and then to use the bed as a conventional couch, a respective guide is provided on the side of each side part of the frame facing the lying surface, a covering extending from side part to side part in the respective guide so that the lying surface is displaceably guided.