Sleep is very important to the health of the body, sleep enough to ensure the health of the body, normal work, study and life. Normal sleep for adults is generally 7-8h, it is recommended to go to bed at around 10 pm, do not stay up late, otherwise it is easy to cause a decline in sleep quality, the body also has a negative impact, while it is recommended to get up at around 6:30 am -7:00 am. Noon can nap, it is recommended to nap about 30min-60min, which is the best nap time, not only to relieve the morning fatigue to promote brain function recovery, but also for the afternoon life and learning to bring sufficient energy.