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.
They asked the participants, questioned at home between 2005 and 2010, to show the interviewer any prescription sleep medication. Approximately 17,000 people responded. The CDC said the study was the first to survey adults about their sleeping aid use, as opposed to tracking prescriptions. Among the report's findings: About 4 percent of adults 20 and older used prescription sleep aids in the last month. The percentage of adults using a sleeping pill increased with age.