Insomnia is one of the most common sleep disorders, with a prevalence of 40% in adults. It is generally believed that 10%–15% of the adult population suffers from chronic insomnia, and an additional 25%–35% have transient or occasional insomnia.1 The symptoms of insomnia may be difficult falling asleep, sleep latency more than 30 minutes, or sleep efficiency less than 85%, which usually happened more than 4 nights a week and occurred at least 3 weeks.2 Patients with insomnia may feel tired, tense, lazy, or have delayed reactions, distraction, or headache. The serious consequence of insomnia can be mental illness, and the worst mental illness is schizophrenia.
