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health.howstuffworks.com/sleep.htm

HowStuffWorks "How Sleep Works"

Sleep refreshes the body and the brain. Learn about why we sleep, brainwaves and REM sleep, the dangers of not getting enough sleep and dreams.
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#230 in How Stuff Works, #314 in Sleep, #40,892 in Medical, #43,108 in Health, #68,846 in Science
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