Children often wake up in the middle of the night, crying, consider the following aspects: 1. calcium deficiency, can lead to increased neuroexcitability, manifested as night waking, crying, sleep restlessness, excessive sweating, should be given to do trace element examination, clear diagnosis under the guidance of doctors, adjust the dose of vitamin D, while calcium supplementation more sunshine, more calcium-rich food, such as milk, soybean products, nuts, etc. 2. play during the day more The baby may wake up and cry in the middle of the night due to excitement, tiredness or frightening stimulation, which can help him/her sleep and provide a good sleeping environment. 3. Weak spleen and stomach, accumulation of food and indigestion lead to sleep disturbance, which can also lead to waking up and crying in the middle of the night. Infections, otitis media, etc., can cause waking and crying, and such children should go to the hospital for examination and clear diagnosis and treatment.