Dreaming always crying is commonly seen in the following situations: first, nocturnal seizures, mostly seen in children and adolescents, seizures during sleep at night, perfect nocturnal dynamic electroencephalography (EEG) examination can confirm the diagnosis, especially when dreaming and crying, the EEG reference value is greater, and oral antiepileptic drugs are effective in treating the problem after diagnosis. Second, mental trauma, mostly seen in patients who have been subjected to specific mental trauma, such as domestic violence, sexual assault or witnessing certain fearful events, which causes serious trauma to the psyche and makes them prone to crying in their sleep, which can be improved through psychological counseling and psychotherapy. Third, the plant nervous function disorder, mostly seen in women, there is weakness, panic, sweating, anxiety, upset, easy to dream a lot, insomnia, can appear often cry in their sleep, most of the patients have a lot to do with the mood, regulate the plant nervous function treatment is effective.