If a small child is irritable at bedtime, it may be related to factors such as eating and drinking before going to bed, as well as neurological dysfunction and fever. Usually try not to let the baby eat too much food at one time before going to bed, otherwise it is likely to affect the digestive ability of the stomach and the symptoms of stomach upset, which will lead to the occurrence of irritability at bedtime. In addition, attention should also be paid to improve from the usual work and rest time, do not let the baby too tired, play too long, otherwise it is likely to lead to the night before going to bed seriously affect the rest. Pay attention to the general condition of your child’s body, such as temperature, bowel movements, heart rate and so on. Abnormalities in any vital signs are likely to lead to illness. For example, a high body temperature with fever can lead to irritability, dry stools, and inability to have a bowel movement can also lead to symptoms of irritability. It can also be triggered by a rapid heart rate and cardiac complaints, such as having a congenital heart disease.