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While you were sleeping: An investigation into sleeping grumpy face

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By Marc Abrahams

18 January 2023

Âé¶¹´«Ã½. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Josie Ford

Snoozing grumpy face

“Grumpy face during adult sleep: A clue to negative emotion during sleep?” is a published not long ago in the Journal of Sleep Research. Researchers Jean-Baptiste Maranci, Alexia Aussel, Marie Vidailhet and Isabelle Arnulf at Pitié-Salpêtriére University Hospital in Paris surveiled 91 sleeping adults. They report that 89 of them frowned measurably. The measurements were made by recording the sleepers’ faces and monitoring electrical activity in the muscles above their eyes.

The researchers decided that people with certain sleep disorders showed “painful expressions and rarely sadness and anger in connection with apparently…

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