Children do not sleep soundly at night, be alert to the following reasons: 1, be alert to whether not eat enough, if the amount of milk is not enough, not eat enough, will also cause sleep is not sound. 2, if the daytime by the shock, or due to too much activity, over-excitement will make the child sleep at night is not sound. It is recommended to reduce strenuous exercise during the day and avoid over-excitement before going to bed at night to avoid poor sleep at night.3. Be alert to whether there is vitamin D deficiency, vitamin D deficient children will appear to have restless sleep, excessive sweating and other manifestations. At this time, it is recommended that appropriate supplementation of vitamin D, but also appropriate supplementation of calcium, can quickly relieve the symptoms. In the daytime to outdoor sunshine, 1-2 hours a day, is conducive to the production of vitamin D in their own skin.