Fig. 5: Enrollment and scheduling process of participants.

PD Parkinson’s disease, HC healthy control, vPSG video polysomnography, RBDSQ Rapid Eye Movement Sleep Behavior Disorder Screening Questionnaire, H-Y Hoehn and Yahr, PD-RBD- Parkinson’s disease without rapid eye movement sleep behavior disorder, PD-RBD+ Parkinson’s disease with secondary rapid eye movement sleep behavior disorder.