Why is there a person you have never seen in your dream?

There is nothing to explain about the content of dreams, and you should not believe in the so-called dream interpretation. As long as you know how dreams are formed, everything will be simple, don't worry. From a scientific point of view, dreams are the result of the interaction of various central points in the brain that control various functions of the human body. Some brain cells are still active when people sleep, which is the basis of dreaming. People will go through a transition period from waking state to sleeping state or from sleeping state to waking state. During this period, the nerve cells in the cerebral cortex are often in a state of incomplete inhibition, which is physiologically called hypnosis. At this time, various stimuli inside and outside the body will cause different brain reactions from usual, thus producing dreams. Therefore, the generation of dreams cannot be separated from two conditions: ① the brain is in a hypnotic state; (2) Stimulation in vitro or in vivo. For example, when sleeping, I accidentally put my feet out of the quilt. Because my feet are stimulated by cold, I will dream of crossing the river barefoot and running barefoot in the snow. Under hypnosis, the brain is in an abnormal or super-abnormal stage (contrary to normal brain function), and many tiny traces that have long been forgotten will appear in dreams, and even some unrealistic fantasies will become reality in dreams. The cerebral cortex is generally in a state of inhibition, so many things become manic and chaotic, which seems incomprehensible. But if we carefully analyze dreams, we can still find clues related to real experiences. Of course, dreams can also show the realization of some daytime wishes, such as studying hard and preparing for exams during the day, but being satisfied in dreams, which is the embodiment of "thinking day and night".

People's understanding of dreams often has the following problems: first, whether dreams are prophetic. This situation can't be said to be completely absent, but it is unlikely. A man once complained that he found in his dream that every wooden bridge he passed was painted white, and the next day he was very surprised to find that the bridge was really white. In fact, the bridge was repainted white a few days ago, but he didn't pay attention when he passed by, but the white bridge was unconsciously printed into his brain. In his dream, things that he didn't pay attention to during the day appeared unconsciously, so this dream appeared. As for saying that dreams can predict the good or bad in the future, most of them are unfounded. There is also the problem of "strange bedfellows" and "Many people dream together". Although this situation is rare, it happens occasionally. If a country is besieged, the mayor will issue an order that all men, women and children should take up arms against the enemy as soon as they hear the gunshots. That night, a man and a woman were lying in bed, suddenly dreaming that guns were rumbling and flames were soaring, and they woke up. But it was quiet around, and there was no sign of the enemy attacking. Looking carefully, it turned out that the cat jumped over a poker, and the poker was knocked over from the stove, which triggered the same dream between husband and wife with a bang.

People usually dream for a short time. However, dreamers often feel that the time is very long, and even think that the whole night is a dream. This is the illusion that the brain suppresses the judgment of time during sleep. It is impossible to dream all night. According to the research of sleep physiology, the time spent dreaming every night will not exceed 1.5 hours, while the total sleep time every night is 6 hours on average.

Therefore, dreaming is a physiological phenomenon in sleep and a reflection of traces in real life (past or present), so the appearance of dreams should not have much impact on health. Many psychologists even think that everyone dreams at night, but some people dream for a short time and forget when they wake up the next day, so it seems that they have no dreams. If you dream for a long time, you will feel tired. If you often dream for a long time, you should go to a psychologist to check to see if there is any brain function problem. If necessary, make some preparations or take some medicine before going to bed.