The 5-year-old child sleeps and swallows due to poor sleeping posture, reflux esophagitis, stomatitis and other factors. 1. poor sleeping posture: 5-year-old children sleeping in a poor posture, may make the salivary glands under pressure, when the child to change the sleeping position, the pressure of the salivary glands will instantly release the accumulated saliva, resulting in children reflexively swallowing. 2. Reflux esophagitis: If the baby suffers from reflux esophagitis, the contents of the stomach and duodenum reflux into the pharynx or mouth at night when the baby sleeps, causing the baby to keep swallowing. 3. stomatitis: stomatitis baby can be stimulated by inflammation of the oral mucosa and secretion of a lot of saliva, resulting in the baby sleep, swallowing, and the baby’s oral mucosa can be seen in rashes, blisters, ulcers and other phenomena. In addition, there are many other reasons can lead to 5-year-old children sleep swallowing, it is recommended to go to the hospital in a timely manner to identify the cause of the disease, as soon as possible to receive treatment.