The Longitudinal Impact of Excessive Daytime Somnolence on Motor and Nonmotor Symptoms of Parkinson's Disease in a Southeast Asian Cohort.

Objective: Sleep-wake disturbances, such as excessive daytime somnolence (EDS), are nonmotor symptoms of Parkinson's disease (PD) and significantly affect the quality of life. This study aimed to examine the relationship between EDS and motor and nonmotor symptoms of PD.

Methods: Eighty-two patients with idiopathic mild PD were followed up twice a year for 2 years and assessed on sleep, mood, anxiety, cognition, function, and disease severity.