Why You Really Need Your Beauty Rest

Good sleep gives us way more than we realize.

Scientists are still trying to figure out exactly why we need to sleep for our survival, but they are certain of one fact. Sleep is as vital to your good health as diet and exercise are, and now new research is contradicting some of our long-held assumptions about the best way to get that good night's rest. Test your sleep knowledge with our quiz.

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PUBLISHED: 06/23/2008