While most people don't function well after an extended stretch of four or fewer hours of sleep a night, there may be a very small percentage who can thrive under these circumstances. In a landmark 2009 study, researchers discovered a genetic mutation in a mother and daughter who seemed to need much less sleep than the average person — the first time any mutation relating to sleep duration had been found (while the sample size wasn’t huge, the effect was replicated in mouse and fruit fly...
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