6-year-old children sleep less 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: the human body lacks calcium, will make the brain as well as the plant nervous system excitability enhancement, resulting in less sleep. You can go to the hospital to do micronutrient tests, if diagnosed with calcium deficiency, you can under the guidance of the doctor to supplement calcium and vitamin D. In normal life, you can let your child eat more fresh vegetables and fruits, as well as soy products, dairy products, animal liver and other foods, drink more milk, more sunshine is conducive to promoting the absorption of calcium, so that the quality of sleep to be able to improve; in addition to dietary aspects of attention, you should also pay attention to Increase outdoor physical exercise, such as jumping rope, swimming, playing ball games, etc., to enhance physical fitness; 2, sleep irregularity: some children sleep less, is due to irregular daytime sleep, such as daytime nap too long, etc., long-term sleep time irregularity will lead to insomnia, or neurasthenia, amnesia and so on. It is recommended that you do not take too many daytime naps, do not play too exciting games before going to bed at night, do not stay up late, and do not do intense exercise. Adopt a regular sleep schedule, you can drink a glass of milk before going to bed to help you sleep; 3, mental stress: the child may be encountered during the day in the school to affect the mood of things, or due to the approach of the examination, etc., may lead to excessive pressure on the child, poor mood, it is recommended that parents timely psychological enlightenment, relieve the pressure.