Elementary school students need about 9-10 hours of sleep a day. If they go to bed at night according to the best sleep time of 8:00-9:00, the best time to wake up in the morning is from 6:00-7:00. The specific morning wake-up time for elementary school students varies with their families, living habits, arrival time, and distance from school. Elementary school students should develop the good habit of going to bed early and waking up early, not doing too many exciting activities before going to bed, not watching too much TV or cell phones, and going to bed at 8:00-9:00 pm. Adequate sleep is the basis for normal growth and development, because the secretion of growth hormone increases at night after sleep, in a pulsatile manner, and reaches its peak in the 3rd or 4th stage of sleep, so 11:00 at night to 5:00 the next morning is the time of the highest growth and development, at this time should ensure its sleep. The sleep time of primary school students is 9-10 hours, but there will be individual differences, some sleep a little longer, some sleep a little shorter, but as long as the growth and development of primary school students is normal, height and weight growth is normal, not tired, not sleepy, attention can be focused, sleep time is usually a little difference is not a big deal. In general, elementary school require a 7:30-8:30 a.m. arrival time, so you can get up at 6:00-7:00 a.m., wash up and eat breakfast, and then weigh the time needed to get up according to the time needed to get to school.