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

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For science quickly, I'm Gary Sticks.

Dreams may say something about the psyche, but they also say something about disease states.

Dreams may even be something we can take some control over.

To find out about all this, Scientific American got in touch with sleep expert, Isabel Arnulf,

who is head of the Sleep Disorders Clinic at Pitey Salpetriere Hospital in Paris.

During her career, Arnulf, who is also a professor of neurology at Sorbonne University in France,

has researched a broad range of sleep conditions.

Sleepwalking, rapid eye movement, sleep behavior disorder, lucid dreaming,

sleep in Parkinson's disease, and hypersomnia,

hypersomnia being excessive daytime sleepiness. Professor Arnulf is with us now to talk about

sleep and dreams.

Hello, Professor Arnulf.

Welcome to the podcast.

Hello.

Thank you.

So REM sleep behavior disorder has been a real focus of your research.

Can you tell us what that is and how you've found that it interacts with dreams and also how it might help us to better understand dreams?

...