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I should probably get some of this... but I guess the "night-lock" is only on certain pages
Sleep is a bodily state in which the body and mind rest. Almost all animals must sleep to survive, but scientists do not know why.
Sleep is a bodily state in which the body and mind rest. Almost all animals must sleep regularly to survive, but scientists are not sure why. However, sleep seems to play in important role in growth and memory processing, and sleep deprivation can lead to immune system deficiencies and a signficant decrease in judgement and reaction time.
Sleep occurs in several phases, which vary in the type and intensity of the [[brain]] activity that occurs.
== References ==
*[http://www.ninds.nih.gov/disorders/brain_basics/understanding_sleep.htm Brain Basics: Understanding Sleep], National Institute of Neurological Disorders and Stroke
[[Category:Biology]]
[[Category:Biology]]
*[http://www.sleepfoundation.org National Sleep Foundation]