Dreams are a form of thinking activity in the human brain. In the process of social activities, human beings have to contact many things in the surrounding world, and the images of these things are stored in some nerve centers in the cerebral cortex. When people sleep, most nerve centers are in a state of inhibition, but some nerve centers are still in an excited state, and a lot of stored information is comprehensively processed, and some processed contents are stored by nerve centers. And when you wake up, you can have a more complete memory, which is a dream. Different sleep states lead to different completeness of what you can recall. The information stored in each nerve center is different, which leads to the formation of different bizarre, strange and unimaginable dreams in nerve activity.
Dreams are not reality, but a part of nerve centers in the cerebral cortex are incomplete and inaccurate, which is not necessarily the result of comprehensive processing of actual information, so we can't reason, judge or explain anything on this basis. We should treat all kinds of dreams with a scientific attitude.