{"doi":"10.1177/0333102420911209","title":"The prevalence of hypnic headache in Iceland","abstract":"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.","journal":"Cephalalgia","year":2020,"id":73460,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":12,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.5779,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2020-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":386188,"name":"I Scher","orcid":"0000-0003-4599-9834","position":1,"is_corresponding":false},{"id":238558,"name":"Dawn C. Buse","orcid":null,"position":2,"is_corresponding":false},{"id":386189,"name":"Gretchen E. Tietjen","orcid":"0000-0003-0524-5683","position":3,"is_corresponding":false},{"id":234917,"name":"Richard B. Lipton","orcid":"0000-0003-2652-2897","position":4,"is_corresponding":false},{"id":17636,"name":"Lenore J. Launer","orcid":"0000-0002-3238-7612","position":5,"is_corresponding":false},{"id":35966,"name":"Unnur Valdimarsdóttir","orcid":"0000-0001-5382-946X","position":6,"is_corresponding":false},{"id":386190,"name":"Lárus S. Guðmundsson","orcid":"0000-0003-4660-1111","position":7,"is_corresponding":false},{"id":386856,"name":"Jon H. Eliasson","orcid":null,"position":0,"is_corresponding":true}],"reference_count":14,"raw_metadata":null,"created_at":"2026-07-18T21:45:32.034078Z","pmid":"32151153","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}