The popular explanation for the problem of dreams is that you think during the day and dream at night. Modern science's exploration of dreams recognizes that dreams are the thinking behaviors that occur when most of people's thinking cells are at rest and a small number of brain cells are in a weak and free state. This part of thinking behavior is weak in logic because of the participation of free and rational thinking, and at the same time, because it is not interfered by rational thinking, the image is stronger than memory. This part is basically a pure phenomenon of free thinking, which psychoanalyst Freud thinks is only an appropriate venting situation of the subconscious mind; Forecasters in ancient China believed that dreams were only the expression stage of human innate potential. Freud can learn from the interpretation of dreams, and the ancient culture of China can learn from the Duke of Zhou. In the late 1970s, a scientist discovered through experiments on mice that dreamy sleep was also related to memory. Dreamy mice can remember their experiences better than those deprived of dream sleep, but the results of this study are not applicable to humans, because doctors use an inhibitor called monoamine oxidase when treating patients with mental depression, which can completely cancel people's dream sleep, but will not cause memory impairment.