Since the discovery of electricity and the invention of electric lights, people’s habits of working at sunrise and resting at sunset have been challenged, and more and more people prefer to work or move around at night, which will reduce the amount of time spent sleeping at night. In order to ensure that the next day still have plenty of energy, then nap seems necessary. It is said, “Rest is to go farther.” Indeed, being able to take a nap at noon will indeed give you magical powers. Naps are usually scheduled after lunch, 15-30 minutes of rest after lunch and then sleep, do not lie down immediately after the meal. Napping time of 15-30 minutes is appropriate. If it is too long, it is easy to disrupt the biological clock and affect sleep at night. If it is more than 30 minutes, then sleep enters a deep sleep phase and it is not easy to wake up. This stage of sleep is deep, muscles are completely relaxed, heart rate and breathing rate are slow and regular, and it takes 1-1.5 hours to enter this stage. If you do not wake up within 30 minutes, then simply finish this sleep period. Napping too long just get up within half an hour will feel a headache, general weakness, a little activity after the gradual recovery. In order to ensure the quality of naps, generally speaking, to develop a daily habit of regular rationing. The best time to take a nap is in the middle of the day’s work or activities. For example, 6-8 hours after waking up in the morning, or 8-10 hours before going to bed at night, even if there is no sleep at this time, you can also lie down to rest. Secondly, the nap habit should be consistent, because irregular sleep can also disrupt the biological clock and affect the sleep pattern, if you sleep again by 3-4 pm, unless you have arrangements in the evening, it will affect your normal sleep at night. Avoid sleeping on the wind, and cover your chest and abdomen with something to avoid wind chill. Now there is a new view that half an hour of sleep before meals is more effective in eliminating the effects of fatigue. Some people do not nap habits, but like to doze off, dozing is also a normal physiological phenomenon. People’s fully awake state, can only maintain 4 hours, rest moments can be recharged for life. If the elderly yawn and doze off at times, then consider the possibility of early cerebrovascular disease, should pay attention to the need to seek medical advice.