Insomnia refers to difficulty in falling asleep or waking up early, which affects work the next day. There are many causes of insomnia, such as environmental factors, some medications, and some diseases, such as chronic diseases, which may cause insomnia in patients. It is also somewhat related to the patient's personality. From the perspective of traditional Chinese medicine, the main reasons for insomnia include the following: The first is Yin deficiency and excessive fire. The heart is associated with fire and the kidneys with water. If the heart's fire is too strong and the kidney's water is insufficient, it can cause insomnia. Additionally, patients with damp-heat conditions can also experience insomnia because too much damp-heat can disturb the mind and lead to insomnia. Moreover, some patients have excessive liver and gallbladder fire and a quick temper, which can also lead to insomnia. Another group of patients has both heart and spleen deficiencies; if both the heart and spleen are deficient in blood, it can result in insufficient nourishment for the mind's blood, ultimately leading to insomnia. Thus, patients with both heart and spleen deficiencies can suffer from insomnia.