The main reason for being sleepy after eating is that after eating, the gastrointestinal tract needs more blood supply to help digest the food, and the blood supply to the brain is relatively insufficient at this time, so the human body will appear sleepy after eating. Some people are prone to vagal hyperactivity after eating, and the vagal hyperactivity will lead to vasodilation and a drop in blood pressure, which will make them sleepy, and in severe cases, these patients will not only be sleepy, but also have postural hypotension. Therefore, people with this condition are recommended to take a little rest after eating to ensure that the stomach is digested and then the blood is restored, and this time the phenomenon of sleepiness will get better again. When eating, do not pursue too much, a small number of meals, can also help to alleviate the symptoms of sleepiness when eating full.