Abstract: A framework spanning the lower end of a mattress and positioned to use overlying bedding materials for creation of an enclosed open space on the upper surface of the mattress for the free movement of feet and lower limbs of humans. The controlled environment within this space provides ample surface area to allow healthful movement of air currents, heat and humidity and thus enable unrestrained natural radiation of body heat through the feet of sleeper(s) encouraging the beneficial outcomes of nocturnal circadian rhythms. With comfort and convenience as high priorities, this bedding accessory is designed for long-term use in therapeutic and household settings.