National Sleep Foundation

How Sleep Works

• Let Sleep Work For You
• The Sleep Environment
• What Happens When You Sleep
• ABC's of ZZZZs -- When You Can't Sleep
• How Much Sleep Do We Really Need?
• Myths -- and Facts -- About Sleep
• Animals' Sleep: Is There a Human Connection?
• Sleep-Wake Cycle: Its Physiology and Impact on Health (PDF - to download Adobe Acrobat click here.)

http://www.sleepfoundation.org/

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