8. Shorter Sleep Requirements
Sleep needs vary, but emerging research suggests that some people may be evolving to require less sleep. Certain populations carry rare gene variants—like the DEC2 mutation—that enable them to function optimally on as little as four to six hours of sleep per night.
This adaptation could offer advantages in modern societies where time is at a premium, and the demands of work and social life often cut into rest. As these gene variants become more common, we may see an increasing number of individuals thriving on shorter sleep cycles. Scientific American