Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

J-P. That's Y-A-K-U-L-T dot-C-O-J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American 60 Second Science.

I'm Annie Sneed.

Humans are hardly alone in their need for sleep, as any cat owner knows.

But what about other very different animals?

In thinking about this, we wanted to use an evolutionary argument to figure out what is the simplest animal to sleep.

Ravi Nath, a graduate student of biology and bioengineering at Caltech. We decided to sort of approach it from a conservation point of view, like how conserved

the least state is, and looked back into the animal tree and specifically looked at jellyfish.

Claire Bedbrook, also a biology and bioengineering graduate student at Caltech.

Jellyfish have no central nervous system.

They do have neurons. Their nervous system is a sort of loose net of neurons that control the animal's behavior.

There's no control center.

Nath, Bedbrook, and the rest of their team worked with the species known as the upside-down jellyfish.

Unlike jellyfish that we're probably most used to seeing in the wild,

these jellyfish actually rifts their bell on the sort of sea floor, or in our case,

the tank bottom, and they pulse in place.

These habits made this jellyfish easy to observe.

The researchers recorded the animal's behavior during the day and at night to see if these

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