The science and symptoms of sleep paralysis In REM sleep, our bodies are paralyzed so we don't act out our dreams and risk hurting ourselves or others, Jalal said.

Around 30% of people will experience sleep paralysis at least once. Here’s why and what you can do about it.

Sleep paralysis, experienced by 30% globally, involves hallucinations during REM sleep. Baland Jalal, a Harvard researcher, studies its causes and terrifying experiences. Stress, irregular sleep ...

Around 30% of people will experience sleep paralysis at least once. Here’s why and what you can do about it.

The hallucinations experienced during sleep paralysis are either hypnagogic hallucinations, which occur when a person is falling asleep, or hypnopompic hallucinations, which happen when waking up.

Many people who experience sleep paralysis see frightening hallucinations some call "sleep paralysis demons." - Illustration by Leah Abucayan/Alberto Mier/CNN Baland Jalal lay in bed terrified ...

Many people who experience sleep paralysis see frightening hallucinations some call "sleep paralysis demons." Illustration by Leah Abucayan/Alberto Mier/CNN via CNN Newsource ...

Around 30% of people will experience sleep paralysis at least once. Here’s why and what you can do about it.

Though scientists know that wake-sleep glitch is what’s happening during a sleep paralysis episode, they’re not entirely sure why. But there are several factors that can increase the risk of ...