Duke Zhou met his classmates and alienated himself, dreaming that his classmates alienated themselves.

Dreaming is normal, because people relax when they sleep. When they relax, their fatigue of the day will be relieved. At that time, deep memories will be fragments, and with the editing of stories by your brain, they will become dreams. And the quality of sleep may not be very good. If I can help you, I hope you can accept it. Thank you.