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Live Longer?

Too much or too little sleep is associated with a shorter lifespan—although it's not clear if it's a cause or effect. (Illnesses may affect sleep patterns too.)

In a 2010 study of women ages 50 to 79, more deaths occurred in women who got less than five hours or more than six and a half hours of sleep per night.

Sleep also affects quality of life.

"Many things that we take for granted are affected by sleep," says Raymonde Jean, MD, director of sleep medicine and associate director of critical care at St. Luke's-Roosevelt Hospital Center in New York City. "If you sleep better, you can certainly live better. It's pretty clear."

(Credit: Corbis)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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