Modern medicine has confirmed that nightmares are often a harbinger of some diseases in the human body, which can remind people to be alert to diseases as soon as possible. The stimulation caused by human pathological changes is often reflected in dreams. When people are awake, the weak stimulation of diseases is mostly covered by various external stimuli. After falling asleep at night, the amount of information transmitted to the human body by the outside world is greatly reduced, and the stimulation from internal organs dominates the brain, thus causing unconscious vigilance and reaction.
Modern medicine explains in detail that people have nightmares during sleep: the function of the body and organs declines or there are latent lesions. Causes such as aura of sudden heart failure, tachycardia or bradycardia. The nervous system of the brain is stimulated by powerful external information. Effects of chemicals in natural environment on human organs. The change of living environment will lead to the decline of people's psychological endurance.