The hypocaust system. The hypocaust system (hypocaustum in Latin) was a heating system used in (wealthy) Roman homes and Roman baths, and the closest thing to central heating today. The hypocaust was a system that circulated hot air under the floor and surrounding walls. Hypocaust construction
CDC: Nearly 9 millon Americans use prescription sleep aids. Nearly 9 million U.S. adults take prescription sleep aids, with use more common among those who are older, female, white and better educated, according to the first government survey of its kind released on Thursday.
Published: January 2013. Humans spend almost 30% of their lives sleeping. Since the 1970s, physicians have begun to recognize many of the detrimental consequences of sleep disturbances produced by abnormal breathing patterns, or sleep-disordered breathing (SDB).