Zhi Bai Di Huang Wan for insomnia is effective in treating insomnia due to Yin deficiency and internal heat, but is not effective in treating other types of insomnia. Zhi Bai Di Huang Wan contains medicines such as Zhi Mu, Huang Bai, Ze Xie, Chen Pi and Fu Ling, whose main effect is to nourish Yin and lower fire. Due to yin deficiency, patients may experience hot flashes, night sweats or short red urine at night, as well as dizziness or sleep disorders. For sleep disorders caused by Yin deficiency and internal heat, oral administration of Zhi Bai Di Huang Wan can alleviate them to some extent. However, for other types of insomnia, such as heart and spleen deficiency or inflammation of liver and fire, taking Zhi Bai Di Huang Wan is not effective and the patient should be given evidence. Insomnia caused by heart and spleen deficiency can be treated by taking GUIZUAN WAN orally, while insomnia caused by liver fire can be treated by taking CHAI HU XIAO LIVER SAN orally.