The prevalence of hypnic headache in Iceland

• Published in: Cephalalgia
• Main Authors: Eliasson, Jon H, Scher, Ann I, Buse, Dawn C, Tietjen, Gretchen, Lipton, Richard B, Launer, Lenore J, Valdimarsdottir, Unnur A, Gudmundsson, Larus S
• Other Authors: This study was supported by: Icelandic Research Council, University of Iceland Research Fund and Migraine Research Foundation.
• Format: Article in Journal/Newspaper
• Language: English
• Published: SAGE Publications 2020
• Subjects: Iceland
• Online Access: http://dx.doi.org/10.1177/0333102420911209; http://journals.sagepub.com/doi/pdf/10.1177/0333102420911209; http://journals.sagepub.com/doi/full-xml/10.1177/0333102420911209

Objective To determine the prevalence of hypnic headache. Background The exact prevalence of hypnic headache is unknown since there are no published population-based prevalence studies. Methods This study was a pilot for the SAGA cohort study, a population-based study on life stressors and various indices of health. Of 1398 invited adults, 921 (66%) participated; 402 men (average age 45.6 years, SD 13.2) and 519 women (52.6 years, SD 11.1). Subjects answered a headache questionnaire including a screening question for hypnic headache. “Do you have a headache that occurs only during sleep and causes wakening?”. Diagnosis of hypnic headache was made by clinical interview using ICHD-3 criteria. Results Among 921 participants, six screened positive for hypnic headache, of those two 0.22% (95% CI 0.06–0.79%) had probable hypnic headache and none had definite hypnic headache. Conclusion Confirming that hypnic headache is rare, these data suggest a 0.22% prevalence of probable hypnic headache.