9 Groundbreaking Discoveries About Sleep

There's a lot about sleep that we don't understand, like why we even sleep in the first place, for example. Here are some amazing discoveries biologists have made while trying to solve the mystery of sleep. Hosted by: Hank Green ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn't make SciShow without them! Shout out to Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magn

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