Effect of Slow-release Melatonin (Circadin®) Therapy on Idiopathic RBD: a Pilot Study

Inclusion Criteria: * REM sleep behavior disorder according to ICSD-3 criteria * No cognitive deficit or symptom of Parkinsonism * Those with written consent. Exclusion Criteria: * who took medication (ex. clonazepam) for REM sleep behavior disorder * with degenerative neurologic disorder (ex. Parkinson's disease, Multiple System Atrophy, Lewy-body dementia, etc.) * who took medication that can affect REM sleep behavior disorder (anti-depressant: SSRI, TCA, MAO-inhibitor) * who is unable to answer questionnaires * who have hypersensitive reaction to medications * Pregnant women or breastfeeding * who are diagnosed with other parasomnia disorder * with severe medical disorder (severe liver failure, respiratory failure, heart failure, malignant tumor, etc.)