Air mattress

Air mattress comprising:

• (a) an upper sheet formed of a polymer plastic which is transparent to ultra-violet light,
• (b) a lower sheet formed of air-tight material, and
• (c) a layer of ultra-violet light reflective material on the upper surface of the lower sheet divided into a grid-like pattern comprising a plurality of individual reflective areas divided by non-reflective areas, the two sheets being sealed together to form a plurality of air-tight pockets in which substantial portions of the sheets are held in spaced relationship so that a person lying on the upper sheet not only receives ultra-violet light directly on his upwardly-directed surface, but also receives ultra-violet light indirectly on his downwardly-surface, at least one of the pockets being provided with a closable filling hole.