[Sleep and wakefulness disorders in neurodegenerative diseases].
The article reviews the phenomenology of sleep and wakefulness disorders in Parkinson's disease and Alzheimer's disease. Degeneration of sleep and wakefulness centers, secondary effect of other symptoms of diseases and side-effects of drug therapy lead to a widespread prevalence of sleep and wakefulness disturbances in these patients. Along with the review of actual literature concerning mechanisms of development and clinical features of these disorders, the authors discuss principal methods for their treatment.