The best time to drink pure milk in the morning, milk is rich in calcium, and calcium to be well absorbed requires the participation of vitamin D. If you drink pure milk in the morning, after the next morning and afternoon of outdoor activities, sunlight exposure to the body to produce vitamin D, which is conducive to the morning drink in the pure milk of calcium for good absorption and utilization. Drinking milk in the evening helps to relieve the symptoms of insomnia, which contains tryptophan plays a key role in brain sleep, especially for the elderly effect is more obvious.