Each sleep cycle in the neonatal period lasts about 45 minutes. Sleep is divided into deep sleep and light sleep. The younger the baby is, the longer the light sleep time is, accounting for about 1/2 of the sleep time. deep sleep is characterized by little movement and regular whistling. In light sleep, there are often sucking movements, muscle tremors, facial smiles, sometimes like making a face, sometimes pouting, body like stretching, sometimes a sudden burst of muscle movement, occasional vocalization, irregular whistling. In adult light sleep is often dreaming, but whether the baby is dreaming, no one knows. Some mothers observe their babies very carefully, mistaking the performance during light sleep for restless sleep and possible discomfort, and taking too much care of their babies, which in turn affects the normal sleep of their children. Therefore, it is important to remind mothers to recognize the manifestations of light sleep of their babies. In light sleep, do not think that the baby has any discomfort except for breastfeeding, and try not to disturb the baby’s beauty sleep by too much care and nursing. Because light sleep is important for brain development. If you do not disturb him during light sleep, let the two states of deep sleep and light sleep alternate and gradually prolong the night sleep, which is good for brain development.