A method for quantifying airflow, in the form of a measured airflow rate, through a porous surface. The method is particularly useful for ventilated sleep surfaces used to prevent SIDS. Provided that one knows the correlation between air flow rate and CO.sub.2 washout times, the resulting measured airflow rate provides an indication of whether a ventilated sleep surface is providing sufficient airflow to effectively dissipate the CO.sub.2. One can determine the minimum measured airflow rate that is effective to provide a minimum adequate level of CO.sub.2 dispersal. Thus, a ventilated sleep surface system that produces an air flow sufficient to result in the minimum airflow rate, as measured by a suitable airflow meter, can effectively dissipate CO.sub.2 and reduce the risk of SIDS.

A warming system, mounted to the foot of a bed, warms a person's lower extremities by directing air into the space between the mattress and overlaying blankets. A blower directs air into an elongated distribution chamber having many tiny exit apertures. The chamber is mounted at the foot of the bed, so that air exiting the apertures warms the person's feet. For maximum thermal transfer, the chamber is placed under the sheet and any blankets, but above the mattress cover and fitted sheet. The chamber may be implemented by a length of open cell foam, a hollow manifold with many punctures or other tiny distribution apertures, collapsible pocket, etc. While the person is lying on the bed beneath the blankets, with feet proximate the foot of the bed, the blower directs temperature-regulated air into the chamber and through the exit apertures, thereby warming the person's feet. A temperature regulator ensures a normothermic air temperature (or alternatively, hyperthermic air temperature.) Thus, the invention helps relieve or prevent "cold feet" by directing normothermic air at a person's lower extremities. Additionally, by applying heat to the feet and legs, the invention encourages blood flow by virtue of sympathetic vasodilation and local temperature-mediated vasodilation. The invention is also believed to prevent some leg and foot ulcers from forming by maintaining the lower extremity at a near normal temperature during sleep.

Airflow through a piece of furniture, such as a ventilated mattress of an infant sleep system, is conditioned. When applied to an infant sleep mattress, the conditioning improves the infant's sleep environment to promote the infant's health and/or enhance sleep. The conditioning can include the distribution of beneficial gases, vapor, heat, or other conditioning elements into the airflow. The conditioning can also include filtration of the airflow.

A pediatric mattress that includes a sleep surface and a perimeter. The perimeter includes a cavity that is configured to receive the sleep surface. The perimeter also has at least one opening disposed into a chamber positioned within same. The opening is configured such that a gas may flow from the chamber through the opening and over the sleep surface. In addition, the pediatric mattress may include a percussion therapy system. The percussion therapy system includes an audio generator and at least one speaker. The speaker is connected to the audio-signal generator and is configured to produce and direct audio signals to the sleep surface.

A mattress assembly, comprising: substantially nonporous bottom and side walls forming a mattress foundation; a mattress inner core disposed in the mattress foundation being permeable to air; nonporous top cover covering the mattress inner core, the nonporous top cover having apertures at predetermined locations to allow the flow of air therethrough; and a fan disposed with the mattress assembly for forcing air into the mattress inner core whereby the air is forced out the top cover so as to reduce the accumulation of carbon dioxide in bedding on the top cover of the mattress.