The causes of insomnia caused by weight loss mainly include excessive dieting and strenuous exercise before bedtime, as follows: 1, excessive dieting: excessive dieting patients will lead to anemia and malnutrition, and these conditions will cause the patient to appear hungry at night, thus causing insomnia. 2, strenuous exercise before bedtime: if the patient is in order to lose weight before going to bed to carry out strenuous exercise, it also affects the night sleep, thus causing insomnia symptoms. This will cause insomnia. Therefore, for weight loss patients, need to be reasonable dietary changes and exercise mode adjustment, pay more attention to the rational structure of the diet, need to appropriate supplement animal quality protein and carbohydrates, to avoid causing night hunger. In addition, do not carry out strenuous exercise within two hours before going to bed, so as to avoid disturbing the sleep.