Why sleep rules our lives

Thursday, March 23, 2023

In today’s newsletter, we examine how deeply our bodies need sleep; discover a suspect behind mysterious shark deaths … and watch puppies for National Puppy Day. (Really, we’re working!)

PHOTOGRAPH BY MAGNUS WENNMAN

Are you most alert late morning? Or early evening? Kind of sleepy after lunch?

Those highs and lows? They’re from the circadian rhythms that influence everything from our body temperature to moods, appetite, and sexual desires.

At the heart of it is sleep—and science has surprises that challenge assumptions.

Read the full story here.

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STORIES WE’RE FOLLOWING

PHOTOGRAPH BY BRIAN SKERRY, NAT GEO IMAGE COLLECTION

Shark carcasses are washing up without livers. What’s behind that? (Pictured above, a suspect?)

For centuries, these shipwrecks were hidden—far from the current-day sea

Weight-shaming often leads to weight gain—and sometimes serious health conditions

The delicate art of turning fog into drinking water

This is the real Jesus, according to archaeologists

The rise in Pagan tourism in the U.S.

Colon cancer is rising among young adults. Here are signs to watch for.

Brother John? Maid Marion? What part of the Robin Hood tales are true?

IN THE SPOTLIGHT

PHOTOGRAPH BY LYNN JOHNSON

A story of hope: Almost five years after the deadliest antisemitic attack carried out in the U.S., a Pittsburgh community is beginning to rebuild. Pictured above, architect Dan Rothschild stands on sheets of paper with Post-it Notes made during listening sessions.

“There was definitely pain and anger and negative thoughts, but something had happened by people talking and hearing each other,” Rothschild told Nat Geo about rebuilding after the 2018 Tree of Life synagogue massacre. “They began thinking about what comes next … they started to heal.”

REBUILDING BEGINS

PHOTO OF THE DAY

PHOTOGRAPH BY JOSEPH BAYLOR ROBERTS, NAT GEO IMAGE COLLECTION

Who’s a good boy?! Our obsession with puppies isn’t new—just look at these vintage puppy pics (above, puppies eating at a dog food company’s laboratory in Chicago, 1942). The leading theory as to why we love pups so much is due to a release of dopamine and oxytocin that’s triggered in the brain when humans look at these furry creatures. Oh, and happy National Puppy Day!

Related: What’s your dog thinking? A brain scan offers clues.

AWWWW!

Today’s soundtrack goes to the dogs: Man of the Hour, Norah Jones

Today’s newsletter was curated and edited by David Beard, Hannah Farrow, and Jen Tse. Have a story idea? Sleep tips or a favorite dog? Let us know here. And … have a friend who might want our newsletter to brighten their day? Here’s the signup.

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Why sleep rules our lives

Why sleep rules our lives

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