Why does a girl say that she is dating Duke Zhou?

Dating the Duke of Zhou = sleeping or dreaming, as the saying goes, "dreaming of Duke of Zhou" or "going to see Duke of Zhou". After all, what is the relationship between "Duke of Zhou" and "Dream"? The system of rites and music in the Zhou Dynasty was handed down by the Duke of Zhou. Praised by Confucius. The Analects of Confucius? Say ":"Confucius said: "Am I failing? I haven't dreamed of Duke Zhou for a long time. 』」

This shows that Confucius' admiration for Duke Zhou is in a dream. Later generations used "dream week" to remember sages, and later it was synonymous with sleeping.