The causes of babies sleeping with their eyes half-open usually include congenital eyelid closure insufficiency, congenital glaucoma, etc., which require prompt medical treatment once discovered. The baby sleeps with eyes half-open in medicine is called eyelid closure insufficiency, which may be related to physiological factors and pathological factors, physiological factors mainly refers to congenital eyelid closure insufficiency, this kind of people in the sleep eyelid will leave a gap, but as long as the cornea is not exposed it will not cause obvious adverse effects, so there is no need for special treatment. In addition, congenital glaucoma can also cause the eyes to be half-open during sleep, which can lead to an imbalance between the volume of the orbit and the size of the eyeball, thus causing the eyes to be half-open during sleep. There may be other reasons for babies to sleep with their eyes half-open, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.