Babies always shake their heads when sleeping can be seen in physiological phenomena, pathological conditions (such as ear canal disease, vitamin D deficiency, scalp eczema, etc.). 1. Physiological phenomenon: If the sleeping environment is at a higher temperature, wrapped or wearing more clothes, it can make the baby sweat more, stimulate the scalp and produce the phenomenon of head shaking, which is a normal physiological phenomenon. Adjusting the temperature of the sleeping environment and reducing the clothing wrapped as appropriate, the above phenomenon can be relieved. 2. Pathological conditions: (1) Diseases of the ear canal: such as eczema of the external ear canal, cerumen embolism or otitis media, which can make babies experience ear discomfort, such as ear pain, tinnitus or obvious itching, which can make babies shake their heads during sleep. (2) Vitamin D deficiency: in the early stage of the disease, babies can cry easily and irritation, but also sweaty scalp stimulation, head shaking, affecting the phenomenon of sleep at night, and some of them can be accompanied by cranial cartilage and other bone changes. (3) Scalp eczema: for more serious babies, there may be obvious itchiness, and some of them may have localized oozing, resulting in obvious discomfort, which may be manifested in the above phenomena. Babies always sleep shaking head may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.