The so-called "ghost pressure" is definitely not a "ghost" pressure bed, let alone a "ghost" obsession. In fact, it is a disease of sleep disorder. The phenomenon of "ghost crushing the body" belongs to a symptom of sleep paralysis in sleep neurology. At this time, the patient is half awake and half asleep, and the amplitude of brain waves is also awake. Some people will also have hallucinations, but the muscle tension of the whole body is minimized, which is similar to the "paralyzed" state, and the whole body can't move, just like being put on a golden bell jar, which is what most people call a "ghost."