The baby always shakes his head when he sleeps, which may be caused by physiological factors, allergic factors, rickets, seizures and other reasons. 1. Physiological factors: the baby’s body has a high basal metabolic rate, compared to adults afraid of heat, if the baby sleeps in the clothes or cover the quilt is thicker, easy to cause head sweating, more sweat to stimulate the scalp, may appear to sleep always shaking his head. 2. Allergic factors: some babies are allergic, easy to pollen, animal hair and other substances to produce allergic reactions, is likely to induce eczema on the head, resulting in more pimples on the scalp area, pimples, easy to cause itching of the scalp, which may occur always shaking the head while sleeping. 3. Rickets: some babies due to severe lack of vitamin D and calcium, resulting in rickets, resulting in increased nerve excitability, resulting in more head, it may be due to sweat stimulation and the phenomenon of always shaking your head when you are sleeping, but also can be accompanied by night terrors, frequent crying and other manifestations. 4. Epileptic seizures: some babies have a history of epilepsy, is likely to sleep at night when the epileptic focal seizures, which may show always shaking the head while sleeping, may also be accompanied by twitching hands and feet, foaming at the mouth and other manifestations. There may be other reasons for babies to shake their heads in their sleep, so it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.