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Why Do We Have to Sleep

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.
Season 3 Episode 48 Length 07:54 Premiere: 09/28/15

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Specials

Season 3 Episodes

The Strange Science of the Placebo Effect
S3 E55 Length 06:15 Premiere Date 11/16/15

The REAL Physics of Hot Air Balloons!
S3 E54 Length 05:51 Premiere Date 11/10/15

This is a SUPER BLOOD MOON! Lunar Eclipses Explained
S3 E53 Length 03:58 Premiere Date 11/02/15

Do Other Animals Mourn Their Dead?
S3 E52 Length 04:59 Premiere Date 10/26/15

How To Hit A Fastball (According To Science!!!)
S3 E51 Length 05:55 Premiere Date 10/19/15

What Color Is The Moon?
S3 E50 Length 03:39 Premiere Date 10/12/15

El Niño and Why We Can't Predict the Weather
S3 E49 Length 06:16 Premiere Date 10/05/15

Why Do We Have to Sleep
S3 E48 Length 07:54 Premiere Date 09/28/15

Theory vs Hypothesis vs Law
S3 E47 Length 06:48 Premiere Date 09/21/15

Eight Incredible Deep Sea Oddities
S3 E45 Length 02:34 Premiere Date 09/01/15

I Don't Think You're Ready for These Jellies
S3 E44 Length 04:46 Premiere Date 08/31/15

My Date With A Giant Pacific Octopus!
S3 E43 Length 03:07 Premiere Date 08/30/15

Cuttlefish: Tentacles In Disguise
S3 E42 Length 03:54 Premiere Date 08/29/15

The Ruin and Rise of Monterey Bay
S3 E41 Length 03:38 Premiere Date 08/28/15

What Has New Horizons Taught Us About Pluto?
S3 E40 Length 05:55 Premiere Date 08/11/15

What Is Fire?
S3 E39 Length 03:39 Premiere Date 07/27/15

Why Do We Laugh?
S3 E38 Length 06:03 Premiere Date 07/27/15

Why Are Cicadas So Good At Math?
S3 E37 Length 05:32 Premiere Date 07/20/15

Your Salad Is Trying To Kill You
S3 E36 Length 06:03 Premiere Date 07/13/15

How Does A Canyon Become Grand?
S3 E35 Length 04:03 Premiere Date 07/06/15

How Thomas Jefferson Saved America With a Dead Moose
S3 E34 Length 06:00 Premiere Date 06/29/15

Why Are The Bees Dying?
S3 E33 Length 04:01 Premiere Date 06/22/15

Which Came First - Flowers or Bees?
S3 E32 Length 05:19 Premiere Date 06/15/15

The Surprising Places We Waste Energy
S3 E30 Length 03:26 Premiere Date 06/01/15

When Will We Stop Using Oil?
S3 E29 Length 05:10 Premiere Date 05/29/15

Does The Moon Really Orbit The Earth?
S3 E28 Length 02:44 Premiere Date 05/18/15

What's The Loudest Possible Sound?
S3 E27 Length 03:49 Premiere Date 05/11/15

Is Ultron Inevitable?
S3 E26 Length 07:42 Premiere Date 04/24/15

Antibiotic Resistance and the Rise of Superbugs
S3 E25 Length 07:20 Premiere Date 04/15/15

What Color is the Universe?
S3 E21 Length 02:51 Premiere Date 03/16/15

Your #ScienceWoman Heroes
S3 E20 Length 04:46 Premiere Date 03/05/15

Zombie Parasites!
S3 E19 Length 06:01 Premiere Date 03/02/15

Why Does February only have 28 days?
S3 E18 Length 04:28 Premiere Date 02/23/15

Why Vaccines Work
S3 E17 Length 06:38 Premiere Date 02/16/15

How Many Heartbeats Do We Get?
S3 E16 Length 04:27 Premiere Date 02/09/15

5 Weird Involuntary Behaviors Explained!
S3 E14 Length 04:50 Premiere Date 01/26/15

There's No Such Thing As Cold
S3 E13 Length 04:58 Premiere Date 01/19/15

Is Santa Real? (A Scientific Analysis)
S3 E10 Length 05:35 Premiere Date 12/22/14

Why People Don't Believe In Climate Science
S3 E9 Length 06:50 Premiere Date 12/08/14

Building Curiosity
S3 E7 Length 02:06 Premiere Date 12/01/14

Where Do Birds Go In Winter?
S3 E6 Length 04:28 Premiere Date 11/24/14

The Sixth Extinction
S3 E5 Length 08:26 Premiere Date 11/17/14

Why Are Some People Left-Handed?
S3 E3 Length 05:01 Premiere Date 11/03/14

Why I'm Scared of Spiders
S3 E2 Length 03:06 Premiere Date 10/30/14

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