There is a saying in Chinese medicine that "to the sun is hyper, to the yin is sleep," the nature of the raw ground is sweet, cold. It belongs to the heart, liver, kidney meridian. The constant amount of 15-30. 180g of shengdi is very cold. 5g of cinnamon makes 180g of Radix et Rhizoma Shengdi less cold. This formula, therefore, can treat insomnia. But it is only adapted to those with excessive fire in the heart and dry feces disturbing the heart. It is not suitable for Yang deficiency of the spleen and stomach, deficiency in the middle, or loss of concentration.