A child’s crying in bed at night may be caused by physiological factors, or it may be caused by diseases such as vitamin D insufficiency or intestinal colic. 1. If the environment is noisy and the ambient temperature is too high or too low when the child sleeps at night, it will affect the child’s sleep quality and lead to crying; or if the child watched scary TV before going to bed, which leads to nightmares during sleep, the phenomenon of crying in sleep will also occur. 2. If the child is not supplemented with vitamin D, or the exposure to sunlight is insufficient, it will lead to vitamin D deficiency symptoms such as crying at night; or the child suffers from gastrointestinal diseases, intestinal parasitic infections, etc., which will lead to crying in bed because of intestinal colic. There may be other reasons for your child’s crying at night, so it is recommended that you go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment under the guidance of the doctor.