Many doctors in the world have conducted in-depth research on this phenomenon, and there is also a scientific name for it in medicine: sleep paralysis, commonly known as "ghost bed", is a sleep-related disease. Patients can clearly feel the surrounding environment, but their bodies can't listen to their own commands, can't move, can't talk, can't open their eyes if they want to, and sometimes they may be accompanied by corresponding dreams, and some people may even have hallucinations. Sleep paralysis can be divided into sporadic and familial types. There are more familial females than males, but most of them are sporadic, and there is no gender difference. According to American research reports, 40% to 50% people will experience sleep paralysis at least once in their lives. There are certain sleep cycles, which are sleep, light sleep, deep sleep, rapid eye movement (dream) in turn, and then enter the next cycle. Sleep paralysis is mainly due to the early appearance of rapid eye movement, which leads to the inconsistency of each stage of rapid eye movement. Many people have had the feeling that when they just fell asleep or woke up, their consciousness was awake, but they found that their bodies could not move and their eyelids could not be opened. This is caused by the unsynchronized consciousness and body.
Lying on your back, being covered with a thick quilt or holding your chest with your hands, being too nervous during the day and eating too much at dinner are all incentives for "ghost pressing the bed". Those who are haunted by ghosts are all lying on their backs. If you sleep on your side and avoid the above incentives, there will be no haunted bed.