Five-year-old children sleep less, usually with the day and night reversal, emotional exuberance and other physiological factors, or due to nutrient deficiency, hyperthyroidism and other pathological factors. 1. Physiological factors: such as daily sleep day and night reversal, daytime sleep more, the night sleep time will be relatively reduced. Or due to the night before going to bed to watch too radical TV series, books, etc., easy to lead to too much emotional excitement, affecting the quality of sleep, resulting in a reduction in sleep time. 2. Pathological factors: (1) Nutritional element deficiencies: for example, zinc deficiency, calcium deficiency, iron deficiency, etc., all of which may affect the quality of sleep and lead to reduced sleep time. (2) Hyperthyroidism: also known as hyperthyroidism, the onset of excessive sweating, body thinning, poor sleep quality and other symptoms, so sleep time will be significantly reduced. If a five-year-old child sleeps less and has adverse reactions to sleep at night, it should also be considered to be caused by colic, indigestion and other factors. It is recommended to consult a doctor in time and carry out diagnosis and analysis through micronutrient screening, blood test, gastrointestinal examination and so on to clarify the cause of the disease before proceeding with the treatment.