As our days become more and more consumed by doing, by distractions and urgency, sleep, waiting for us every night, offers a surrender. Perhaps that’s one reason so many of us have such difficulty falling asleep—because we can’t lay down our swords. We’re told again and again that we must work harder, must never let our guard down, and we must always fight on. And so we fight sleep, too. Or we stress out about our inability to control it and summon it whenever we want, at the snap of our fingers—the way that we believe we can everything else in our age of On Demand (“your Uber Sleep will arrive in five minutes”).