It is particularly difficult to wake up in the afternoon, the possible reasons include incorrect body position during sleep, too much food before nap, etc., as follows: 1. incorrect body position during sleep, resulting in poorer quality of sleep, such as sleeping on the table, this position will lead to swallowing too much gas during sleep, abdominal distension, chest tightness, the limbs being pressed due to impaired blood circulation, soreness, numbness and other symptoms. 2. too much food before nap. Due to the special power role of food, resulting in a large amount of blood accumulation in the gastrointestinal tract during sleep, promoting the digestion of food, and the symptoms of cerebral ischemia, so the patient will wake up after the nap dizziness, weakness around the body. 3, poor mood before the nap, or in a continuous state of tension, anxiety, the brain nerves have been tense and excited, did not get enough rest. 4, the body suffers from certain diseases, such as napping when Fever has appeared in the cold, there is a lunch is not clean and triggered acute gastroenteritis, etc.