Mysteries of Sleep (2020) | Full Documentary | NOVA

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? Welcome to PBS America, a channel curated for an international audience from America's Public Broadcasting Service, PBS. This is a factual focussed channel including award-winning American history, current affairs and science. SIGN UP to our UK broadcast channel weekly highlights at pbsamerica.co.uk FOLLOW us on X @PBSAmerica LIKE us on Facebook.com/pbsamerica