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And there's no explanation for why it might happen every other day or just every once in a while.

Accounts of sleep paralysis can be found in Persian medical texts dating back to the 10th century.

D., clinical psychologist and fellow of the American Academy of Sleep Medicine, tells Buzz Feed Life.

"It is the complete opposite, actually," Breus explains.

Sufferers become alert in a transient conscious state, but they are unable to move voluntary muscles or speak.

Although involuntary muscle movement, like breathing, is not affected, there is often a sensation of chest pressure, which is why many people wake up from sleep paralysis gasping to take a deep breath.

Unlike the visuals in nightmares or lucid dreams, which occur when the eyes are closed in REM sleep, these hallucinations occur in the state between sleeping and waking when the mind is alert and the eyes are open.

In other parasomnias, such as sleepwalking or REM sleep behavior disorder, atonia does not occur properly and the voluntary muscles move while the mind remains asleep, which is why people can sometimes do crazy things in their sleep and be totally unaware of it.

In sleep paralysis, the body remains paralyzed in REM atonia while the brain awakens and the eyes start to open, explains Breus.

The first clinical observation was made by a Dutch physician in 1664 who diagnosed a 50-year-old woman with "Night-Mare." It was believed to be caused by demons or spiritual possession until the 19th century, when it was termed "sleep palsy" and eventually "sleep paralysis" in medical texts.

Swiss painter Henry Fuseli's painting is said to be inspired by supernatural dream experiences and the growing interest in sleep paralysis among doctors at the time.

The body must go into REM sleep, and it must come out of it, but sleep paralysis occurs when the body has trouble making these transitions.