Because the Double Ninth Festival calls many people at home, the message of "caring, worrying and caring for your family" in the emotional area of your brain is stronger and leaves a deep impression. When you go to sleep, this kind of emotion becomes active again, because the activity of the brain can be triggered by emotion. Under the control of emotion, you can look for the information of the same kind of emotion from memory. As you usually remember when you are angry, it will always be an "angry" memory.
Under the influence of "caring, worrying and caring", the information that makes people "worried and worried" in your brain memory is found out during sleep and pieced together into a "dream".