Dreams are formed by unconscious and disorderly links of information in the brain. Some are forgotten by you, and the information on the edge of memory will be called, which is amazing.
But in fact, most dreams are unpredictable. If dreams can foresee reality, and this foresight can be interpreted, such an able person does exist. I can say that only 99.99% people have such an able person, and they will never meet him once in their lives. Many people have this kind of distress: they often have nightmares and even wake up after falling asleep. Because I didn't sleep well, I felt dizzy the next day, which affected my work and study. Some also worry that nightmares will bring bad luck to themselves, causing psychological fear and anxiety.
In fact, dreaming is a normal psychological phenomenon that people appear during their sleep. Under normal circumstances, human brain nerve cells are in a state of inhibition during sleep, and this inhibition process is sometimes complete and sometimes incomplete. If it is not completely suppressed, there are still a few nerve cells in the cerebral cortex in an excited state, and people will dream. Because the activities of a few cells when awake lose the control and regulation of the whole cerebral cortex, some memory fragments in daily activities during the day will naturally become active and may show strange dreams different from normal psychological activities. At this time, if nerve cells related to language and movement are also excited, they will not only dream, but also talk in their sleep or sleepwalking.