Abstract: A stowable bed system for a mobile vehicle. The stowable bed system includes two operating rails, and a fixed upper box for receiving and stowing a vertically movable bed. The operating rails 109 are engaged to each of the sleeper side walls within the sleeper compartment of a vehicle. The fixed upper box is engaged to the upper ends of the operating rails near the top of the sleeper compartment. The vertically movable bed is engaged between and at each end to one of the operating rails. The movable bed may be moved upwards along the operating rails to be stowed under or within the fixed upper box. The movable bed is used for sleeping in the lower position along the operating rails.