Humans have been fighting our internal clocks ever since we invented sitting around a campfire. We have powerful natural rhythms that keep us on a 24-hour cycle; if you’ve ever been steamrollered by jet lag after an intercontinental flight, you know how powerful those rhythms are. But we muffle them with caffeine, alarm clocks, and electric lights. It’s easy to undo the damage, though. One weekend of camping can do the trick—and it’ll even cure your case of the Mondays.
In 2013, resea