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.
Although more than 200 sleep disorders centers exist in the United States, experts estimate that 95 percent of those suffering from sleep disorders go undiagnosed, suffering needlessly from conditions that could be treated. On the following pages, you will find descriptions of the 9 most common sleep disorders.