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Sleep is a natural state of bodily rest observed throughout the animal kingdom . It is common to all mammals and birds , and is also seen in many reptiles , amphibians and fish http://en.wikipedia.org/wiki/Sleep
A sleep disorder (somnipathy) is a medical disorder of the sleep patterns of a person or animal. Some sleep disorders are serious enough to interfere with normal physical, mental ... http://en.wikipedia.org/wiki/Sleep_disorder
Definitions of sleep at Dictionary.com. ... Sleep Facts Learn More About Sleep Problems: Signs & Treatment Options www.SleepMedication.Info http://dictionary.reference.com/search?q=sleep
Fact sheet on normal sleep and sleep disorders developed by the National Institute of Neurological Disorders and Stroke (NINDS). http://www.ninds.nih.gov/disorders/brain_basics/understanding_sleep.htm
sleepfoundation.org is dedicated to improving the quality of life for Americans who suffer from sleep problems and disorders such as insomnia, sleep apnea and restless legs ... http://www.sleepfoundation.org/site/c.huIXKjM0IxF/b.2417141/k.C60C/Welcome.htm
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