There are two common reasons for dreaming and crying in sleep, as follows: 1, due to dreams of unhappy things cause mood swings, so reflected in dreams; 2, usually too tired, too nervous, recently encountered sad things, will bring bad emotions into the sleep, so dreams of sad things appear crying. Some people usually have the symptoms of insomnia, easy to think wildly, so there will be a variety of dreams, there will be crying, laughing, fear and other emotions; as long as it does not affect the quality of sleep, there is no discomfort, this situation is a normal physiological phenomenon, do not worry. If you don’t stay up late, have a calm mind and don’t think too much, you can ensure good sleep quality, pay attention to the routine of life and rest, eat lightly before going to bed, and don’t eat too much.