Food does not have the efficacy and effect of improving sleep, but walnuts, milk, cinnamon, jujubes, bananas and other foods contain nutrients that are beneficial to sleep. 1. Walnuts. Walnuts are also rich in cerebral lecithin, have nutritional brain cells, and have a certain role in improving sleep. Walnuts are also rich in melatonin, which helps regulate sleep. 2. Milk. Milk is rich in tryptophan. Drinking a cup of hot milk will produce a feeling of fatigue and help promote sleep. 3. Cinnamon. Cinnamon has glucose and all kinds of vitamins, which can provide nutrients for the brain and help improve sleep. 4. Banana. Bananas are rich in potassium ions, after appropriate consumption, it is conducive to the stabilization of nerve cell function in the body, which helps to improve sleep. However, it should be noted that the food in the effective substance content is limited, can not play a role in the treatment of disease, and does not have the effect of improving sleep, if necessary, should be timely medical treatment, standardized treatment under the guidance of a doctor.