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…and how did it evolve in the first place?
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↓ More info and sources below ↓

Why do we sleep? We spend a third of our lives in slumber, but science has yet to determine exactly why we have do it. Here’s a look at how sleep works, why we’re not getting enough sleep, what happens if you DON’T sleep, and an idea about where sleep came from in the first place.

Follow me to The Good Stuff’s sleep playlist:    • How Science Changed Sleep Forever  

Also check out BrainCraft:
   • How to Beat Jet Lag  
   • Amazing Effects of Sleep (And Lack of...  

For more, read:

“Dreamland: Adventures in the Strange Science of Sleep” by David K. Randall http://amzn.to/1MB38dt

"The Universal Pastime: Sleep and Rest Explained" by Dr Richard Horner http://amzn.com/B00NT9O60O

Cool research on melatonin in sea worm larvae: http://www.nytimes.com/2014/10/02/sci...

Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below!
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  / jtotheizzoe  
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It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
Follow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
Facebook:   / itsokaytobesmart  
For more awesome science, check out: http://www.itsokaytobesmart.com
Produced by PBS Digital Studios:    / pbsdigitalstudios  

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Arts & Labor - Motion Graphics
Katie Graham - Camera
John Knudsen - Gaffer

Theme music: “Ouroboros” by Kevin MacLeod

Other music via APM
Stock images from Shutterstock, stock footage from Videoblocks (unless otherwise noted)