How much is enough sleep?

How Much Sleep Do You Really Need?

Although many factors influence how much sleep you really need, the common recommendation is eight hours a night. But individual needs vary greatly. By Michael Breus, PhD, D, ABSM WebMD Feature Reviewed By Stuart Meyers, MD

Although many factors influence how much sleep you really need, most young adults report sleeping about seven and a half hours on weekday nights and eight and a half hours on weekend nights. And the common recommendation is eight hours a night. But individual needs vary greatly. There are so-called short-sleepers and long-sleepers – those who need as little as five and a half hours to as much as about nine and a half hours.

How much sleep you require depends on several factors including:

* Your inherited genetic need
* Your sleep hygiene (those daily activities you control, from drinking coffee or alcohol to smoking and exercise)
* The quality of your sleep
* Your 24-hour daily cycle known as the circadian rhythm 

Taken from Webmd^^^ http://www.webmd.com/content/article/62/71838.htm

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