Auricular Acupuncture for Primary Insomnia

Inclusion Criteria: * Meet the diagnosis of PI according to DSM-5; * Aged 18-64 (including 18 and 64); * Provided a signed written consent form. Exclusion Criteria: * The patient has somatic disease like severe respiratory, circulatory, endocrine system disease and hepatic/renal insufficiency; * The patient suffers from moderate / major depression (BDI score ≧ 8 points), moderate / severe anxiety disorder (SAS score ≧ 61 points) or any other serious mental disease; * The patient who abuse drug alcohol or substance; * The patient suffers from dementia or any other severe cognitive impairment; * The patient is in pregnancy or lactation period; * Patient who is a night worker or stick to irregular sleep pattern, and can't or don't want to terminate this kind of work mode; * The patient has history of suicide or suicidal tendency; * The patient is allergic to Eszopiclone or any other sedative-hypnotic drugs; * The patient who has taken psychiatric, hypnotic or antihistamine drugs during the last 4 weeks before baseline, however, the patient who use the prescription or nonprescription hypnotic drugs no more than twice a week can be recruited as soon as drug withdrawal; * The patient who is receiving ongoing psychological treatment; * The patient who has obstructive sleep apnea, restless leg syndrome, sleep rhythm disorders, parasomnias, etc.