Sleep and neurodegenerative diseases.

Sleep disturbances are common in neurodegenerative diseases. Disturbed sleep can result in fatigue, irritability, morning headaches, impaired motor and cognitive skills, depression, and daytime somnolence. The major sleep complaints include: insomnia, hypersomnia, parasomnia, excessive nocturnal motor activity, circadian sleep-wake rhythm disturbance, and respiratory dysrhythmia.