Why do you often see ghosts when you have a shadow?

Some people who experience the pressure feel like someone is standing in their room, or pressing on their chest. They tried to move their limbs but couldn't. Did they see ghosts then?

>>>Decode the shadowing phenomenon

It was a normal night, but Salma, a 20-year-old student at American University in Cairo (Egypt), experienced a terrible time. The girl woke up, unable to move her limbs, feeling like someone was in the room. She saw a bloody creature, baring its fangs, like "an image in a horror movie" standing beside her bed.

After that, the girl recounted this to researchers who were conducting a survey of the phenomenon of shadowing - a common phenomenon but not yet explaining, when a person wakes up but feels not Can move, lift limbs. Up to 40% of the respondents said they had been overly shadowed, and some, like Salma, felt that someone was standing by their bedside.

Researchers say the shadow appears when a person wakes up in the REM cycle.

"The weight of a balloon can be an extremely scary feeling for some people, and it is clear that what causes the effect will be of great use to those who suffer from shadowing , " said Baland Jalal, a divine scientist. Business at the University of California in San Diego (USA) said.

Researchers say the shadow appears when a person wakes up in the REM cycle (fast eye movement) of sleep. [Two-cycle sleep : NREM and REM in which REM is the dream cycle appears. ]. During this sleep phase, people often dream, but some people have limbs, their muscles are almost paralyzed - this may be an adaptation of the body to help people act in the absence of dream.

It is difficult to explain why some people experience a pressure that feels like someone is standing in their room, or pressing on their chest.

There is a positive explanation that it is an illusion , when a brain region has a certain disturbance. "Perhaps, in the human brain there is an image of a pattern, a certain image," Jalal said. Previous studies have suggested that the brain region may be part of the parietal lobe - located above and between the brain.

It is possible that while the balloon is pressing, the parietal lobe that controls the nerve cells in the brain commands the limbs to move, but in fact the limbs are not moving, moving, so the brain is disturbed, creating illusion about someone's image, "a black shadow is at the top of the bed".

This idea, though appealing and intriguing, is difficult to verify. It is thought that people may have different experiences about the phenomenon of shadowing due to different cultural beliefs and beliefs. Previous studies have shown that some cultural beliefs can affect the way people perceive phenomena.

For example, in a 2013 study published in the Journal of Culture, Medicine and Psychiatry, Jalal and his colleague Devon Hinton from Harvard Medical School, studied the Stress phenomenon and stress level that people in two different societies experience: Egypt and Denmark. They discovered that, compared to the Danes, the Egyptians suffered more from the pressure, and feared more death because of the ballooning.

The Danish people who participated in the survey said they thought the shadow was due to psychological factors.

"These are two very different cultures; Egyptians are very religious believers, while Denmark is one of the most atheistic countries in the world , " Jalal said.

Most Danes who participated in the survey said they thought the shadow was due to psychological factors , malfunction of the brain or lying in a wrong position; while Egyptians are easy to believe in because of a supernatural force.

Jalal and his colleagues conclude that those with supernatural beliefs often experience greater fear while under pressure, as well as more obsession. It may even be true that fear also causes people to experience more shadows and vice versa.

"If you are afraid, the fear will be activated in the brain centers, meaning you can be fully awakened in the shadow, and experience the feeling of fear," Jalal said. "Going through the shadow, you will be more afraid - and then, you have beliefs and beliefs, you will be even more afraid."

Jalal said he thought a scientific explanation of the shadow could help people who often experience a sense of calm or nervousness, instead of assuming it was caused by supernatural forces.