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National Institute of Neurological Disorders and Stroke: Sleep
Name URL
http://www.ninds.nih.gov/disorders/brain_basics/understanding_sleep.htm
Do you ever feel sleepy or "zone out" during the day? Do you find it hard to wake up on Monday mornings? If so, you are familiar with the powerful need for sleep. However, you may not realize that sleep is as essential for your well-being as food and water.