One third of a person’s life is spent in sleep, and the strong human need for sleep accompanies people throughout their lives. Sleep has an impact on many aspects of our physical health, our ability to work and our quality of life, and deserves the attention of each of us. Concerned about sleep disorders should understand the following concepts: (1) Insomnia: sleeping for more than 30 minutes, waking up in the middle of the night and not being able to go back to sleep immediately, waking up early or all sleep time equal to or less than 6 hours. Insomnia is the most common symptom of sleep disorder, leading to daytime drowsiness, fatigue or excessive sleep and discomfort the next day. (2) Early awakening: waking up early in the morning at least one hour earlier than usual and not being able to go back to sleep. (3) Difficulty falling asleep: Refers to the inability to fall asleep when going to bed and to fall asleep more than 30 minutes after the lights in the room have been turned off. (4) Absence of sleep sense: Some insomniacs feel insomnia themselves, but no sleep abnormality is found by bystander observation or sleep EEG, called subjective insomnia or no sleep sense. (5) Insomnia is divided into three categories: ① transient insomnia (lasting a few days); ② short-term insomnia (lasting equal to or less than 3 weeks); ③ long-term insomnia (lasting more than 3 weeks). If you have any of these symptoms, it is recommended that you visit a professional institution to clarify the cause.