sleep disorder

CANADA - Scientists are learning more about a violent sleep disorder in which people kick and yell while sleeping.

When people enter REM sleep, they're in a deep sleep. Normally, the brain sends signals to prevent muscles from moving. 

But those signals are disrupted in people with REM Sleep Behavior Disorder. It can lead a person to act out in dreams, sometimes becoming physically violent.

Researchers in Canada studied nearly a thousand older adults with the disorder. They found patients were more likely to be on antidepressants to treat depression or have PTSD. 

The condition was also more common in men.

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