Why is there such a statement by Duke Zhou?

The real Duke of Zhou in history was a saint with outstanding political talent. Cao Cao took him as an example for his own study and wrote a poem like "The Duke of Zhou spat out food and the world turned to the heart" for comparison. Now people talk about Duke Zhou, mostly because of his existence. The author of this book cannot be verified, but it is definitely not the Duke of Zhou mentioned above. The reason why the name of Duke Zhou was used was mainly because of Confucius. Confucius said that Duke Zhou appeared in his dreams many times. His achievements in life were highly praised by Confucius, and his political ideals were pinned on him. As the status of Confucius in later generations is getting higher and higher, his status as Duke of Zhou is also rising. People in China prefer to be associated with celebrities, so this superstitious book about dream interpretation was named Duke Zhou, because he appeared in Confucius' dreams many times to increase his influence. As a result, Duke Zhou became synonymous with dreams and even sleeping. Everyone says that "seeing Duke Zhou" and "chatting with Duke Zhou" actually means sleeping.