This type of hallucination is a hallmark for many people with sleep paralysis.

Many people who experience sleep paralysis see frightening hallucinations some call "sleep paralysis demons." (Leah Abucayan, ...

Sleep paralysis, a common yet frightening experience, affects about 20% of people, causing temporary immobility and vivid ...

A Strange Yet Real Fear Have you ever opened your eyes in the middle of the night and realized you could not move a single ...

Sign up for CNN’s Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. Baland Jalal lay in bed terrified ...

Sleep also enables the body to repair and replenish cellular material that is damaged or depleted. Important bodily functions ...

"This type of hallucination is a hallmark for many people with sleep paralysis.It occurs during transitions into or out of rapid eye movement, or REM, sleep, similar to a traffic jam at a busy ...