Secondary hypnic headache: A literature review in the last 34 years. Headache Medicine, [S. l.], v. 13, n. 3, p. 163–166, 2022. DOI: 10.48208/HeadacheMed.2022.15. Disponível em: https://headachemedicine.com.br/hm/article/view/648. Acesso em: 22 jan. 2026.