Abstract
To investigate headache-related serum melatonin levels and melatonin excretion rhythmicity in patients with hypnic headache (HH). Strict sleep dependency of headache attacks is a pathognomonic feature of HH. Changes in melatonin levels, a marker for circadian rhythm, are assumed to play a pivotal role in the pathophysiology of HH. Serum melatonin levels were acquired in nine patients with HH and nine age- and gender-matched healthy controls over a 20-hour time period (12 pm, 4 pm, 7 pm, 10 pm, time of headache, and 8 am). No significant changes of melatonin levels could be detected comparing HH patients and healthy controls. Melatonin excretion rhythmicity was not significantly altered in patients with HH (Mean melatonin level in ng/mL ± SD, patients vs controls at 12 pm: 21.5 ± 9.5 vs 13.6 ± 6.3 [P = .077], 4 pm: 18.4 ± 8.4 vs 14.0 ± 4.7 [P = .222], 7 pm: 19.4 ± 5.1 vs 15.1 ± 4.5 [P = .094], 10 pm: 59.5 ± 45.0 vs 29.4 ± 12.7 [P =.136], headache time: 96.9 ± 68.3 vs 49.1 ± 22.8 [P = .94], and 8 am: 31.6 ± 18.3 vs 26.7 ± 15.6 [P = .489]). This study is not able to confirm a significant role of melatonin concentration changes in the pathophysiology of HH and vetoes that melatonin deficiency plays a major role in the pathophysiology of the disorder.
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