You are using an older browser version. Please use a supported version for the best MSN experience.

Why Some People Only Need 4 Hours of Sleep

Researcher Ying-Hui Fu, who studies sleep behaviors and circadian rhythms, at the Weill Institute for Neurosciences at the University of California, San Francisco, discovered that some people have mutations in their genes that give them a superpower-An ability to only need 4 hours of sleep.
image beaconimage beaconimage beacon