Serial polysomnography in cluster headache shows no association with a particular sleep stage and may be aggravated by sleep apnea

Objective: To identify associations of specific sleep stages with the occurrence of nocturnal headache in patients with cluster headache. Background: Cluster headache [CH] is a rare primary headache disorder. Relation to sleep in general and relation to REM-sleep in particular was reported. However, sequential analysis of CH attacks during or related to sleep have not been reported in literature so far. Design/Methods: We performed polysomnography in three patients with episodic CH according to the diagnostic criteria of the International Headache Society (ICHD-II) in four consecutive nights. An independent, exp…