The causes of springtime sleepiness include physiologic and disease factors. Disease factors include respiratory infections, hypoglycemia and so on. 1. Physiological factors Sleeping time: in spring, the day dawns earlier, waking up earlier, sleep time will be relatively reduced, at this time there will be sleepy situation. 2. Disease factors Infectious diseases: In spring, the temperature changes faster and it is easy to catch a cold. When you catch a cold, you may experience symptoms of sleepiness. Hypoglycemia: In spring, if the human body’s activity increases, resulting in a decrease in blood sugar, you may feel sleepy. In spring, you should adjust your living habits, go to bed early and get up early, and get enough nutrition in your daily life. If symptoms of frequent sleepiness occur, you should go to a hospital outpatient clinic.