Sleep-related headaches

Headaches and sleep disorders are frequent and can be associated with each other. Some headache syndromes are related to certain sleep phases or circa dian rhythms. These so-called sleep-related headache syndromes include spec ific types of migraine, cluster headache, chronic paroxysmal hemicrania, an d the hypnic headache syndrome. Except for the latter, they were included i n the International Classification of Sleep Disorders and are described in this article.