Newborns sleep eyes open and close may be caused by the central nervous system underdevelopment, deep sleep and other reasons. 1. Incomplete development of the central nervous system: newborns’ body functions are not mature enough, the central nervous system is not well developed, the optic nerve is relatively weak, and the contraction of the innervated levator muscle is not coordinated enough, so newborns’ eyes will be open and closed in their sleep. 2. Deep sleep: when the body enters deep sleep, there will often be rapid eye movement, and the newborn’s eyelids are not well developed, there will be eyelids with the eyes rotating, thus appearing a burst of a closed phenomenon. If the newborn sleeps with eyes open and closed too often or with other abnormal symptoms, it is recommended to go to the hospital for examination to find out the cause and treat the symptoms.