What is the recommended amount of sleep per night?
Humans, like all animals, need sleep, along with food, water and oxygen, to survive. For humans, sleep is a vital indicator of overall health and well-being. The amount of sleep you need each day will change over the course of your life. Although sleep needs vary from person to person, the general recommendations for an adult is 7 to 9 hours per night.
Source: The National Heart, Lung, and Blood Institute