Safety and Efficacy of THN102 in Patients With Parkinson's Disease and Excessive Daytime Sleepiness

Inclusion Criteria: * Subjects with a diagnosis of idiopathic Parkinson's disease as defined by the Movement Disorders Society (MDS). * Subjects with Hoehn and Yahr scale score ≤ 4. * Body mass index \> 18 kg/m2 and \< 35 kg/m2. * Subjects should have a complaint of daytime sleepiness impacting their quality of life and/or daytime functioning (e.g. falling asleep while reading or watching television, while eating or talking with other people). * Epworth Sleepiness Scale (ESS) score ≥ 14. Exclusion Criteria: * Subjects with known or with a suspected sleep apnea syndrome or who have any other cause of excessive daytime sleepiness, such as shift work sleep disorder. * Psychiatric and neurological disorders (other than Parkinson's disease), * Cardiovascular disorders such as - but not limited to * Uncontrolled moderate to severe hypertension * History or current diagnosis of electrocardiogram (ECG) abnormalities indicating significant risk of safety for patients participating in the study * Recent myocardial infarction * Stable or unstable angina pectoris * Cardiac insufficiency or history of heart failure * Previous history of cardiac valvular surgery * Subjects with current impulse control disorder. * Subjects showing dementia or with MoCA \< 23. * Subjects with current suicidal risk * Current or recent (within one year) history of substance abuse or dependence disorder * Other active clinically significant illness * Subjects with hepatic or renal impairment