Clinical Study to Investigate the Sleep Quality Enhancing Effect of GABA

Inclusion Criteria: * Male and female subjects older than 19 years old * Who is experiencing mild, transient sleep disturbance (pittsburgh sleep quality index ≥ 5, Insomnia Severity Index ≥ 8) * Who voluntarily agreed to participate in the study and signed an informed consent form. Exclusion Criteria: * Who is suffering from severe sleep disorder including sleep disorders due to psychological or neurologic causes. * Who has used sleeping pills or sleep related dietary supplements within 4 weeks before study participation * Who is suffering from obstructive sleep apnea. * Who has used or is expected to inevitably use prohibited concomitant medications during the study. * Women who is pregnant /breast-feeding, or who has childbearing potential and does not use available contraceptives. * Who has dosed other study medications within 30 days before screening. * Who is determined ineligible for study participation by investigators for any other reasons.