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.
Approximately 42million American adults have sleep disordered breathing, one in five adults has mild obstructive sleep apnea (OSA2), and 75% of severe sleep disorder breathing cases remain diagnostic. The global sleep apnea devices market is segmented on the basis of types, end user, and region.