Insomnia is called insomnia in Chinese medicine. Zuo Gui Wan is effective in improving insomnia (insomnia) caused by kidney yin deficiency (insufficient yin fluid in the kidneys), but it is generally ineffective in other forms of insomnia. Zuo Gui Wan is a proprietary Chinese medicine composed of Radix Rehmanniae Praeparata, Cornu Cervi Pantotrichum and Cornu Cervi Pantotrichum. It has the effect of nourishing the kidney and tonifying yin (nourishing the yin fluid of the kidney). It is useful in treating deficiency of true yin, impotence and weakness of the waist and knees, night sweating (abnormal sweating after going to sleep and stopping after waking up), and dryness of the mouth. From the efficacy and effects of Zuo Gui Wan, Zuo Gui Wan has some therapeutic effects in treating insomnia caused by kidney yin deficiency, but other types of insomnia often fail to achieve therapeutic effects, and should be treated under the guidance of a traditional Chinese medicine practitioner to identify the symptoms. The adverse effects of Zuo Gui Wan are not yet clear. Contraindications are pregnant women should not take, children are prohibited. Precautions, avoid greasy food, patients with colds and flu, allergy to this product is prohibited, allergies with caution. Drugs need to be used under the guidance of a Chinese doctor to identify the evidence, individuals should not use blindly, so as not to cause adverse consequences.