Which ancient book does Dream of the Duke of Zhou come from?

The relationship between Duke Zhou and sleep comes from The Analects of Confucius, a pre-Qin work. Confucius said: "I am weak! For a long time, I stopped dreaming about Duke Zhou! " It means, "How old am I? I haven't dreamed of Duke Zhou for a long time! "

Because Confucius highly admired the political system of the Western Zhou Dynasty, Confucius expressed his yearning for the Western Zhou society by "dreaming of the Duke of Zhou". Later, people used this allusion to express their nostalgia for the sages. Yuan Zhen's "Wen Shao Fu" in the Tang Dynasty: "To dream of the Duke of Zhou without seeing him is to think of the sage and his tools." Su Shi's "Duke of Zhou" in Song Dynasty: "I dreamed of Duke of Zhou today, and I have been to the Forbidden City in the Spring and Autumn Period."

Later, Duke Zhou became synonymous with "dream", and sleeping was called "seeing Duke Zhou".

Dream of the funny story of Duke Zhou

There is a story in The Collection of Old Jokes and Little Guang Lin in Qing Dynasty: Teachers sleep during the day, but students are not allowed to doze off. When the student scolded him, the teacher made a mistake: "I am Duke Zhou." Tomorrow, his disciples also worked, and the teacher woke up and warned, "How did you do this?" Disciple said, "I also went to see Zhou Gonger." The teacher said, "What did Duke Zhou say?" Answer: "Duke Zhou said he didn't see his master yesterday."

Teachers sleep during the day, but students are not allowed to doze off. The student asked the teacher, how can you? The teacher lied that he had gone to see Duke Zhou. The next day, the students followed suit.

The teacher picked up a ruler to wake up the students and asked him, "How could you do this?" The student replied, "I also went to see Duke Zhou". The teacher then asked the students, "What did Duke Zhou say?" The student replied, "Duke Zhou said he didn't see your teacher yesterday."