The 6-year-old child with less sleep may be due to calcium deficiency, which is a more common cause, in addition to irregular sleep or the child’s recent mood swings, mental stress, etc., can also lead to less sleep. 1, calcium deficiency: human body calcium deficiency, will make the brain and plant nerve excitability increased, resulting in less sleep. If the child is diagnosed with calcium deficiency, he or she can take calcium supplements and vitamin D under the guidance of a doctor. Increase outdoor physical exercise, such as rope skipping, swimming, playing ball, etc., to enhance physical fitness; 2, irregular sleep: some children sleep less, is due to irregular daytime sleep, such as long daytime naps, etc., long-term irregular sleep time will lead to insomnia and dreaminess, or neurasthenia, forgetfulness, etc.. It is recommended not to take too many daytime naps, not to play too exciting games before going to bed at night, not to stay up late, and not to do intense exercise. Develop a regular sleep schedule, you can drink a glass of milk before bed to help sleep; 3, mental stress: perhaps the child encountered during the day at school affect the mood of things, or due to the approaching exams, etc., may lead to excessive pressure, poor mood, parents are advised to timely psychological guidance to relieve stress.