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.
You dream during REM sleep and a reduction in REM sleep leads to a less restorative or less satisfying sleep. That's why one may not feel completely rested after taking a sleeping pill, even after 8 hours of sleep. There are many medications that physicians can prescribe to help with sleep.