It’s no secret that we live in a sleep-deprived society. More than a third of Americans don’t get enough shuteye, defined as a minimum of seven hours a night. It’s not just the U.S.: much of the ...

Every day, as sunlight streams into your eyes, trillions of tiny clocks in your cells reset. The human body uses light to correctly time myriad processes, ensuring that liver enzymes are made on ...