⁃ Common to all groups:

• Age superior 18 years

• Patients who have received complete information about the study from an investigator and who fully consent to participate.

⁃ For Parkinson Disease (PD):

• Patients followed for PD diagnosed according to international criteria for the diagnosis of PD (MDS criteria),

• A MoCA score greater than 20/30

• No treatment with deep brain stimulation.

⁃ For REM Sleep Behavior Disorder (RBD):

• Diagnosis of RBD according to ICSD-3 criteria: presence on polysomnography of an abnormal elevation of muscle tone during REM sleep (more than 18% of REM sleep without chin atonia) and/or the presence of REM sleep behaviors on video-polysomnography,

• Absence of progressive neurodegenerative pathology: absence of diagnostic criteria for PD, multiple system atrophy, or Lewy body dementia.

⁃ For healthy controls:

⁃ \- No neurological or psychiatric disease