Sleeping on your stomach at noon, burping and breathing.

When lying on the table to sleep, the body leans forward, plus neck stretch, epiglottis by traction, relaxation, so that the esophagus slightly open, chest and abdomen viscera pull down the esophagus, resulting in esophageal negative pressure, gas into the stomach along the esophagus. When you wake up upright, the above conditions disappear, and the stomach turns to positive pressure. Occasionally, the gas in the body is discharged, and you hiccup. You can pinch the tip of the middle finger, and use your left and right fingers to pinch the top of the middle finger. After about one to two minutes, hiccups can be stopped. Remember to exert appropriate force and keep the pain for one to two minutes.