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

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

So if your brain wakes up when you’re in REM sleep, your body is lagging behind. That means you could become mentally awake ...

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 ...

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 ...

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 ...

During sleep paralysis, however, “we regain consciousness before the muscles regain their freedom from REM-induced paralysis,” said Walker, who is also a professor of neuroscience and ...

During sleep paralysis, however, “we regain consciousness before the muscles regain their freedom from REM-induced paralysis,” said Walker, who is also a professor of neuroscience and ...

During sleep paralysis, however, “we regain consciousness before the muscles regain their freedom from REM-induced paralysis,” said Walker, who is also a professor of neuroscience and ...

By Kristen Rogers, CNN (CNN) — 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 ...