Dream is a physiological phenomenon, which means dream, hope, beauty and happiness.
The ancients believed that there was always a reason for dreaming. There are psychological and physiological reasons for dreaming, but even in these two aspects, human beings still can't explain the formation mechanism of dreams.
The events and scenes formed in dreams come from people's existing cognition and memory, including sight, hearing, smell, taste, touch and feeling. All these elements that appear in people's dreams are based on memory.
China was the first country to study dreams. More than 2,000 years before Freud, China had a monograph on dreams-Duke of Zhou, but the interpretation of dreams in Duke of Zhou was not from a scientific point of view. Based on the social and scientific conditions at that time, this book has considerable historical limitations in dream interpretation.