Cluster headache (CH) is a primary headache disorder with relatively effective treatments. Although few sufficiently controlled trials are available, verapamil is recommended as the first-line prophylactic drug for CH by the French Headache Society (with a low level of evidence, level B) and by the EFNS (European Federation of Neurological Societies, level A). Daily doses of more than 480 mg (and up to 1200 mg daily) are frequently used off-label, while 360 mg daily is the only dosage to have demonstrated its effectiveness in a double-blind trial against placebo, and the usual label posology used by cardiologists is 240 mg daily in hypertension.
Cluster headache is characterized by unilateral attacks of severe pain accompanied by cranial autonomic features.
Apart from these there are also sleep-related complaints and strong chronobiological features. The interaction
between sleep and headache is complex at any level and evidence suggests that it may be of critical importance in
our understanding of primary headache disorders. In cluster headache several interactions between sleep and the
severe pain attacks have already been proposed. Supported by endocrinological and radiological findings as well as
the chronobiological features, predominant theories revolve around central pathology of the hypothalamus. We
aimed to investigate the clinical presentation of chronobiological features, the presence of concurrent sleep
disorders and the relationship with particular sleep phases or phenomena, the possible role of hypocretin as well as
the possible involvement of cardiac autonomic control
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