After lunch, the stomach needs to digest and concentrate all the blood in the stomach, and the blood in the brain is relatively less than usual, so it is easy to be sleepy. As well as the effects caused by factors such as personal habits. It is also important to pay attention to the influence of biological clock. So, what are the symptoms that need to be differentially diagnosed for postprandial sleepiness? The following is the differential diagnosis of postprandial sleepiness. 1, fatigue: fatigue, also known as fatigue, is a subjective discomfort feeling. But objectively, it will lose its ability to complete the normal activities or work it was originally engaged in under the same conditions. Fatigue can occur in all diseases at a certain stage of development, so there are many diseases that can cause fatigue. 2.Easy fatigue: feeling tired after a little work. 3.Easy to feel tired: one of the 20 symptoms outlined in the depression self-assessment scale, belonging to the subhealth state, easy to get tired. 4.Job burnout: JobBurnout, also known as job burnout, is a state of physical and mental exhaustion under the heavy pressure of work, the feeling of being tired of work, a feeling of physical and mental energy being exhausted by work.