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- Most people need eight hours of sleep, but a small fraction can do with less than six.
Ying-Hui Fu, a sleep researcher at the University of California at San Francisco, discovered a gene—called DEC2—associated with people who can get away with less than six hours of sleep without any adverse health effects. These folks had gained some form of sleep resistance, which help them ward off negative effects on cognition or risks of cardiovascular diseases that usually arise from sleep deprivation.