Background: We hypothesized that rotigotine may have a positive effect on cognitive function in patients with Parkinson’s disease (PD) by improving daytime motor function and nighttime sleep status due to its 24-hour sustained properties.Methods: We evaluated the effect of rotigotine on motor symptoms, cognitive function, daytime sleepiness, sleep disturbances, and motor symptoms in 10 PD patients with sleep disturbances, defined as a PD Sleep Scale (PDSS)-2 score of ≥ 15, in a single-center, 3-month open-label study. Participants received 24 mg/24 h (patch content: 4.5-9 mg) rotigotine for a 3-month period. At baseline and 3 months, patients were evaluated on the Movement Disorder Society Revision of the Unified PD Rating Scale (MDS-UPDRS) parts III and IV and cognitive assessments, such as the Mini-Mental State Examination (MMSE), frontal assessment battery (FAB) and Montreal Cognitive Assessment (MoCA). The Epworth Sleepiness Scale (ESS) and PDSS-2 were administered at baseline and at 1 month, 2 months and 3 months.Results: At 3 months, MDS-UPDRS part III (-10.7, p<0.001) and MDS-UPDRS part IV (-1.0, p=0.023) scores significantly decreased, MoCA scores (1.7, p=0.0095) significantly increased, and off time significantly decreased (-43.0 min; p=0.029) from baseline. PDSS-2 scores significantly decreased from baseline at 2 months (-14.5, p<0.05) and 3 months (-20.0, p<0.001). ESS, MMSE or FAB scores did not significantly change after rotigotine treatment.Conclusion: Our preliminary findings suggest that low-dose rotigotine could improve motor symptoms, sleep disturbance, and cognitive function without worsening daytime sleepiness in patients with PD.