Health is the level of functional or metabolic efficiency of a living being. In humans, it is the general condition of a person's mind, body and spirit, usually meaning to be free from illness, injury or pain (as in “good health” or “healthy”).
The Benefits of Getting a Good Night's Sleep
The National Institute of Neurological Disorders and Stroke noted that most adults usually need seven to eight hours of sleep each night. Some adults may only need five hours, while others may need 10 hours...
Sleep > Overview
Bethesda > USA