Inclusion Criteria:  Male or female and greater from 30 to 80. Diagnosis of idiopathic PD according to the UK Brain Bank criteria. Epworth Sleepiness Scale (ESS) >7. Stable dose of anti-Parkinson drugs for at least 30 days. No use of MAO-B inhibitors within the preceding 4 weeks. No cognitive impairment, defined by Mini-Mental State Exam score ≤ 26.  Exclusion Criteria:  Diagnosis of atypical Parkinsonian syndrome, vascular Parkinsonism or drug-induced Parkinsonism. Shift-work, which cannot ensure a stable sleep-wake cycle habits. History of contraindications.