Sobreira-Neto MA, et al. - The experts undertook this study to ascertain the frequency of major sleep disorders in patients with Parkinson’s disease (PD), diagnosed according to the third international classification of sleep disorders, and to evaluate the relationship of those disorders with the quality of life. A high prevalence of sleep disorders was observed in patients with PD. In these individuals, the quality of sleep and excessive daytime sleepiness significantly influenced the quality of life.