Inclusion Criteria:  Patients who have adequately understood the whole study procedures within age range of 19-64 years Patients with insomnia severity index (ISI) score of more than 15  Exclusion Criteria:  Cognitive impairment Psychiatric disorders or neurological disorders. Unstable medical conditions Prior diagnosis of sleep disorders Hypnotic prescription History of brain or facial trauma within 3 months Skin abrasions Acrylic acid allergy Electromagnetic hypersensitivity Apnea hypopnea index of >15/hour in the baseline polysomnography.