Abstract: Disclosed herein is a portable bed having particular application for use in an aircraft. The aircraft bed includes a folding frame and a folding mattress to lay on and be supported by the folding frame. The folding frame includes a plurality of upstanding panels that are hingedly coupled side-to-side one another so that the frame can be collapsed from an expanded unfolded configuration at which to support the mattress to a compact folded configuration at which to be suitable for storage. In one embodiment, the folding frame is located between a pair of aircraft seats that face one another, and the mattress extends between the seat portions of the facing seats. In another embodiment, the folding frame is located between an aircraft seat and an upstanding structure (e.g., a wall) of the aircraft, and the mattress extends between the reclined back portion of the aircraft seat and the upstanding structure by way of the folding frame.