Babies want to sleep but can not sleep, clinical possible reasons are over-excitement, environmental factors, disease effects and so on. 1. Over-excitement: babies have intense exercise before bedtime, which also causes them to be more excited during sleep, clinically manifested as difficulty in falling asleep, too much excitement and so on. 2. Environmental factors: If the sleeping environment around the baby is noisy, it is easy to be influenced by the surrounding environment and difficult to fall asleep, which is a normal physiological response. Parents are advised to maintain a good sleep environment for their children. 3. Disease effects: when the baby suffers from disease (such as colds, diarrhea disease, etc.), the body appears uncomfortable symptoms, are easy to cause the baby to fall asleep difficult. Babies want to sleep but can not sleep, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.