There are many reasons why you can’t nap, it may be a stressful work life, excessive psychological burden, resulting in nerve excitement, which can not sleep, in addition to the lunch break environment, personal habits, dietary stimulation, etc. 1, environmental factors: most people nap in a public environment, due to the sound, light stimulation may appear sleepless; 2, personal habits: due to Some people do not have the habit of napping, suddenly at this point in time to nap may fall asleep, generally in the habit of napping will slowly improve; 3, dietary stimulation: a large amount of greasy and stimulating food before the nap will cause excessive gastrointestinal burden, drinking a lot of coffee, strong tea and other excitatory drinks, so that the nerves are excited, will affect the nap; 4, disease factors: such as hyperthyroidism of the sympathetic nerve patients Excited, may be in a state of overexcitement, which affects the nap, the situation can not sleep; 5, other: for example, sufficient sleep at night, diabetes, kidney disease, cardiovascular disease and other chronic diseases cause discomfort, etc., may lead to nap can not sleep. Naps are generally 30 minutes after meals, 30-60 minutes is appropriate to avoid napping for too short or too long. When nap can not sleep, you can relax, appropriate exercise, do not have to force to sleep.