"Healthy sleep is essential for every adult to be at their best," says Cheri D. Mah, a physician and research scientist at the University of California San Francisco (UCSF) Human Performance Center who studies the relationship between sleep and performance in elite athletes. Over the past decade, Mah has worked with various teams in the NFL, NBA, NHL, and MLB—including the Golden State Warriors, San Francisco Giants, Philadelphia Eagles, Toronto Blue Jays and San Jose Sharks, among other teams—to help their athletes find the best approach to getting better rest and ultimately improved performance.