Early in the morning, the community’s chess room has just opened the door shortly, the cheerful Wang sister ran in panic, exclaimed: “Oh no, I met a ghost last night.” She stroked her chest as she spoke, a look of terror on her face, “I woke up in the middle of the night, and it was very quiet around me. Suddenly, a cloud of white mist that looked like a human shape floated over quickly as if it was going to lunge at me. I was scared to death and wanted to call out to my son next door to come over, but I realized that I couldn’t move my body, and my blabbering mouth could only wriggle and not make a sound. I thought in despair, this is the end, by the ghost ShiFaLu, a moment, lose consciousness. Until daybreak, my son pushed the door and shook me awake, and only then could my hands and feet move.” When these words came out, everyone immediately turned their attention to Sister Liu. Auntie Liu on the side was very knowledgeable, gently floated Sister Wang and slowly said, “He Sister Wang, this is called ‘ghost pressure on the bed’, I’ve heard from the old people, you might be about to have something bad.” Auntie Liu deliberately paused for a moment, covered half of her mouth with her hand, pretended to be mysterious, and said to Sister Wang, “You’d better go to the temple to burn incense and ask for a peace talisman.” Wang’s sister-in-law, who was playing cards, interjected: “Last year, my mother-in-law also encountered, she said, as if a ghost pressed on her chest, couldn’t move, couldn’t shout, and was so scared that she peed in her pants. The story is alive and well in our family.” In fact, Wang encountered absolutely not “ghosts” on her body, but a special physiological phenomenon, medically known as sleep paralysis, commonly known as “ghosts pressing on the bed”. The main culprit of “ghosts pressing on the bed” is Sleep paralysis or sleep paralysis, which is a kind of sleep disorder. When a person has a short period of involuntary movement during sleep, he or she feels suddenly paralyzed and weak, and is unable to freely dominate the body, as if a thousand pounds were piled on the chest. And because of the trance to see a transparent invisible object to their own attack, people will be unusually frightened, combined with the strange and bizarre image of the dream, often feel that there is a supernatural force in their own sway. Sleep paralysis is the result of the unsynchronized awakening of the nerve center of the brain and the motor nerve center. When this symptom strikes, people’s brains are in a half-awake, half-asleep state, which means that part of the nerve center has woken up and is able to have a more conscious awareness of the environment, while part of the nerve center has not yet fully awakened, especially the motor nerve center, so the limbs can not be moved at this time, and the larynx and mouth muscles are not controlled and can not make a sound. Some people also have hallucinations of images, but the muscle tone of the whole body is reduced to a minimum. At this time, the individual is prone to all kinds of exaggerated and bizarre hallucinations, especially the most abundant and common hallucinations, such as some green-faced ghosts and ghouls, flitting shadows, and so on. Sometimes it is also accompanied by some strong hallucinations of hearing and touching. As a result, this will bring great and strong horror stimulation to the individual, which will easily lead to physiological abnormalities such as rapid heartbeat, rising blood pressure, erect hair, teeth fighting, incontinence and so on. It has been published on TV or newspapers that certain people claimed to have been swept away by aliens, abducted and dragged to do experiments, and then thrown back to the original place after the completion of the strange experience of not being able to move for half a day, and it is estimated that it may also be closely related to sleep paralysis. What is sleep paralysis all about? What causes it? Generally speaking, 40%~50% of the population are likely to experience sleep paralysis at least once in their lifetime, but most of them are disseminated. Only 3% to 6% of people will experience the symptoms repeatedly. For the average person, sleep paralysis is mostly triggered by factors such as excessive mental load and lack of sufficient sleep. There is a cycle of sleep in a night, and the sleep cycle is in the order of falling asleep, light sleep (1~2 stages), deep sleep (3 stages), deep sleep (4 stages), and finally entering the “REM period” (dreaming or REM period). REM sleep is also called fast-wave sleep, desynchronized sleep or heterophasic sleep, the reason why the name of this stage is because there is a special phenomenon, that is, REM, which can be observed through the instrument that the sleeper’s eyeballs have a rapid beating phenomenon, breathing and heartbeat become irregular, the muscles are completely paralyzed, and it is very difficult to wake up; after waking up from this sleep stage, the vast majority of people will say: “I am having a dream about ……”. When a person is in the “REM sleep” phase, the body appears to be at rest and the connection with the brain is temporarily interrupted. This is a defense measure so that the body does not “copy” the dream into real life. For example, if you dream of hitting someone, you won’t actually act on it and punch or kick the person next to you in your pillow. If the body is overworked or the inner conflict is intense, the individual’s sleep cycle sequence will be disrupted, and the individual will enter the “rapid eye movement period” earlier, resulting in inconsistent coordination of the stages of the rapid eye movement period, and there may be sleep paralysis, and the phenomenon of “attracting ghosts to the body” may occur. The terror of being “possessed by a ghost” can occur. Sleep paralysis is also related to the sleep environment, such as eating a full meal before going to bed, pressing too tightly on the chest, or being covered too heavily, which increases the burden of breathing and leads to the discomfort of “ghosts on the bed”. There are also studies that suggest that there is a relationship with sleeping position, with sleep paralysis occurring mainly in the supine position. Of course, certain medications may also have side effects that cause sleep paralysis. There have been clinical reports of sleep paralysis occurring at night in some patients taking anti-anxiety medications. Sleeping paralysis is not usually accompanied by other complications. The release of sleep paralysis is uncomplicated, as long as a bystander calls or gently pushes the patient, the patient will be able to wake up with the help of an external force, and move his arms and legs, as if he has been released from his acupoints. After sleep paralysis is lifted, the body is mostly unharmed, and generally no special treatment is needed. Prevention of sleep paralysis, the key is to pay attention to regulate their own lives: one is to maintain a good state of mind, with the pressure or negative emotions, to find a suitable cathartic pathway, so as to avoid the devil as a dream; the second is to work and rest in a timely manner, to ensure that adequate sleep, to ensure that full of energy; the third is to pay attention to the environment of the sleep, the change of the sleeping position or choose the appropriate bedding, to improve the quality of sleep.