Abstract: A bed extension device for longitudinally or transversely enlarging the sleeping area of a bedding unit which has a mattress and bed frame. The bed extension device comprises an extension frame member which has a forked extension arm extending downward from one end and a frame leg extending downward from the opposite end. The forked extension arm engages a frame lip of the bed frame of the bedding unit, while the frame leg rests upon a floor surface, causing the extension frame member to be positioned parallel to the mattress of the bedding unit. By placing an extension mattress upon the extension frame member, the sleeping area is thus accordingly increased.