BEN-2001 in Parkinson Disease Patients With Excessive Daytime Sleepiness

Inclusion Criteria: * Subjects of either sex aged 50 to 80 years \*Subjects with previous diagnosis of Parkinson's disease (following the UK Parkinson's disease society brain bank clinical diagnostic criteria)\* * Subjects capable of understanding and complying with protocol requirements * Subjects with medical history of excessive daytime sleepiness Exclusion Criteria: * Subjects with excessive daytime sleepiness due to conditions other than Parkinson's disease (including narcolepsy) * Subjects with clinical evidence of depression with significant psychiatric comorbidities (Hamilton Rating Scale for Depression - HAM-D score greater than or equal to 17; with or without treatment) * Subjects with evidence of significant fatigue (Fatigue Severity Scale - FSS greater than or equal to 36 * Subjects with known history of abuse of alcohol or other addictive substances in the 6 months prior to inclusion. * Subjects with known allergies or hypersensitivity to Bavisant or any of its excipients. * Subjects who are pregnant or lactating.