Sleepiness on a full stomach is mainly related to the fact that the gastrointestinal tract needs more blood, which leads to insufficient blood supply to the brain.
After the human body eats, the gastrointestinal tract begins to work to digest food, and gastrointestinal peristalsis is accelerated. The blood in the body prioritizes the supply of the gastrointestinal tract to enhance digestion and promote the absorption of nutrients, which leads to a decrease in blood supply to the brain. After the relative lack of oxygen to the brain cells, there will be a drop in blood pressure, heart rate slows down, breathing slows down, etc., so that the human body produces sleepiness, sleepy situation.
In addition to normal physiological phenomena, if the symptoms of drowsiness are more serious, such as frequent sleepiness at times other than after meals, it is also necessary to consider the cerebral blood supply insufficiency caused by pathologic factors, and if this occurs, it is necessary to go to the hospital in time to be examined, so as not to delay the course of the disease.