NOVA시즌 47 이미지 교체에피소드 번호4Mysteries of SleepOverviewFrom fruit flies to whales, virtually every animal sleeps. But why? Why do we need to spend nearly a third of our lives in such a defenseless state? Scientists are peering more deeply into the sleeping brain than ever before, discovering just how powerful sleep can be, playing a role in everything from memory retention and emotional regulation to removing waste from our brains. So why are we getting so little of it?Air dateFebruary 26, 2020Runtime (min)55
