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.
A: Melatonin is an over-the-counter dietary supplement marketed to help induce sleep. Melatonin is commonly used to relieve jet leg, insomnia, and trouble sleeping due to shift-work. Taking melatonin will decrease the time it takes to get to sleep, but will not increase the quality of sleep a person has.