The symptoms of drowsiness in the afternoon, caused by the following main reasons: 1, the brain is in a state of fatigue, the need for a reasonable lunch break to ensure the normal blood supply to the brain. If no lunch break or lunch break is too long, it will cause symptoms of insufficient blood supply to the cerebral arteries, dizziness, drowsiness and other symptoms. 2, lunch is too full, if the lunch is too full, a large amount of blood into the stomach to participate in the digestion and absorption of food, it will cause temporary ischemia and hypoxia in the cerebral arteries, drowsiness and other symptoms. 3, taking a certain drug can also cause symptoms of drowsiness, such as compound licorice tablets, paracetamol tablets, etc.. Usually take a reasonable lunch break, do not overfill your lunch, eat a light diet, easy to digest, do not stay up late at night, and exercise more.