Why do people always have nightmares?

Nightmare is a kind of fear caused by the fast and slow heartbeat when people sleep.

Some modern physiologists, psychologists and medical scientists are also constantly exploring the relationship between nightmares and diseases. According to their research, always dreaming of terrible animals such as spiders and poisonous snakes is often a sign that the skin will break; If you repeatedly dream of being chased, falling off a cliff and want to shout but can't, you should pay attention to the pathological changes of your heart; Often dream of brain compression and dyspnea, pay attention to lung diseases; Rotten foods such as rotten fish and shrimp are often found in dream of eating, which may be a harbinger of gastrointestinal diseases.

However, when you sleep at night, the situation is very different. At this time, many cells in the brain have entered a "rest" state, and many strong external stimulus signals have been unable to enter the brain, and the function of coordination and adaptation has been greatly reduced.

Therefore, abnormal signals of latent lesions in the body can activate cells in the corresponding parts of the brain. At this time, the nightmare appeared. Because some nightmare scenes are related to latent lesions in the body, they may become symptoms of disease.