Thinking about it day and night, your mother's death has brought you great pain. It's natural that you miss your mother all the time and dream about her. Duke Zhou's explanation of dreaming of his mother coming back from the dead;
I dreamed that my mother came back from the dead, which was auspicious.
Psychological explanation of dreams: Dreams are spontaneous psychological activities at a certain stage of human consciousness during sleep. In this kind of psychological activity, the whole process of individual physical and mental changes is called dreaming. Dreams are only the image activities of deep cells in the cerebral cortex during sleep due to internal and external stimuli, which have no practical significance.