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A new study determined it takes a split second for our brains to replay and store certain memories when we sleep. HowStuffWorks looks at the science.
Columbia University's Mailman School of Public Health (2006, April 4). Lack Of Sleep Linked To Increased Risk Of High Blood Pressure. ScienceDaily. Retrieved August 31, 2010, from http://www.sciencedaily.com /releases/2006/04/060403230551.htm