A rest unit that can be laid out inside a fuselage of an aircraft, especially for the benefit of the crew, is made up of a plurality of cells of an elongated shape, each cell having longitudinal and transverse dimensions corresponding to a location of a berth, the cells being juxtaposed on at least two levels to form a module of a parallelepipedal outer shape. This module can be incorporated in a rear cone of the fuselage of the aircraft.