“…Excessive daytime somnolence is common among patients with Parkinson’s
disease, affecting 20-60% of patients[57,89,102,123,124,137,144,145,151,182,183,243,259,261,270,272,273,280-296]. Multiple factors influence the prevalence of EDS, including duration and severity of
disease, age, gender, cognition, presence of nocturnal sleep disorders, and mood
disorders.…”