Mysterious Things That Occur While You Sleep
At night we’d like to sleep peacefully and restore energy. Nevertheless, it is difficult to find a person who has never encountered some strange and unpleasant sensations accompanying sleep.
Sleep paralysis

How it feels: The person wakes up at night and cannot move. Added to this are frightening hallucinations and a feeling that there is someone else in the room. In antiquity, this state was associated with mischiefs of evil spirits.
Why it happens: Normally, when we fall asleep, we are paralyzed so that we don’t sleepwalk and such. With sleep paralysis, our muscles "turn off" when the brain is awake.
Approximately 7% of the population have experienced sleep paralysis at least once (source). They say this is more likely when sleeping on the back.
Hypnagogic hallucinations

How it feels: When a person is on the verge of sleeping but still awake, he sees weird pictures before his eyes. Often these are scary faces and fantastic creatures.
Sleep talking

How it feels: Usually, the person who suffers from somniloquy (a fancy term for sleep talking) has no idea about it. This condition is absolutely not dangerous psychologically, though a person with such a problem may worry about blurting out secrets.
Why it happens: Men and children are more prone to this (source), and the reason is stress. The person’s psyche is trying to resist what he or she does not agree with in reality.
A dream within a dream
How it feels: The person sees a dream, then wakes up, but strange things continue to happen to him. It turns out he was just dreaming that he woke up. This has been explored in the movie Inception. Upon the film’s success, many people reported having experienced this phenomenon.
Why it happens: Esotericists believe that if you have such a dream, this indicates your predisposition to spiritual practices. Official science can’t explain why this happens.
Sleepwalking
How it feels: This state is the opposite of sleep paralysis — the consciousness is asleep, but muscle paralysis does not occur. In their sleep, people can walk, clean, or even leave the house, which is often very dangerous. In the morning, they don’t remember anything.
Why it happens: Somnambulism occurs in about 4.6-10.3% of the population, with children affected more often (source). The cause is still unknown, as are methods of treatment.
Exploding head syndrome
How it feels: The person wakes up from a sensation of a loud explosion or a clap. Sometimes the sound seems deafening. It can be accompanied by an increasing buzz or a flash. The phenomenon is not dangerous, but it frightens people. Some think they have had a stroke.
Why it happens: This happens when, for some reason, there is a surge of neural activity in the areas of the brain responsible for processing sound (source). Sometimes the syndrome is coupled with insomnia or jet lag.
Sleep apnea
How it feels: Sleep apnea is a sudden stop of breathing in a dream. The person wakes up as a result. The quality of sleep decreases, the brain experiences oxygen starvation, and it becomes difficult to get enough sleep. Arterial pressure also fluctuates during an attack, which may cause heart problems.
Why it happens: During sleep, the pharynx muscles relax, which sometimes leads to blockage of the airways. Obesity, smoking, and old age increase the risk. Fun fact in a world of anxiety: one may alleviate it by playing the didgeridoo, an Australian wind instrument (source).
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