Duke Zhou dreamed of visiting a big green cemetery.

Dreams, no matter how bizarre, are the reflection of brain activity, which is always related to people's experience, imagination and psychological characteristics. Freud believed that dreams were a reflection of psychological activities. Pavlov believes that "dreams are traces of various stimuli in the past, and now they are combined in the most unexpected way", emphasizing physiological reactions. Modern scientific research has proved that dreams are normal physiological and psychological activities of human beings and a special form of brain information processing. More precisely, it is the result of the right brain, which is sensitive and sensitive, good at thinking in images, processing information independently when getting rid of the left brain, and good at logical thinking such as regression and judgment.