The cortical excitability of newborns is low, and the stimuli from outside are too strong for newborns, so the continuous and repeated stimuli make it very easy to be fatigued, resulting in even lower cortical excitability and sleep. Therefore, in the neonatal period, except for feeding, almost all the time is in sleep. Later on, with the development of cerebral cortex, the sleep time of children is gradually shortened. Normal newborns sleep for about 18-20 hours a day, which varies from one newborn to another. Early neonates sleep relatively long, up to 20 hours or more per day, and late neonates sleep less, at about 16-18 hours per day. The sleep time of newborns is also related to whether the pregnancy week is full term, the child’s birth weight and whether there is a disease state. Generally, children who are born prematurely and have a particularly low birth weight will sleep for a relatively longer period of time. Some newborns have a slightly shorter sleep time, but as long as they are in good spirits, don’t worry. If the newborn’s daytime waking time gradually increases, then the nighttime sleep time should be extended accordingly, to gradually establish the habit of less sleep during the day and more sleep at night, if the lack of sleep will make the newborn’s physiological function disorder, the nervous system regulation failure, poor appetite, resistance to decline.