The European Somnologist certification programme was developed by the European Sleep Research Society to improve patient care in sleep medicine by providing an independent evaluation of theoretical and practical knowledge. The examination of eligible experts plays a key role in this procedure. A process was started more than 15 years ago to create the European sleep medicine curriculum, eligibility criteria for certification, and sleep centre accreditation criteria. The process was characterised by interdisciplinary collaboration, consensus, and achieving new solutions. During the past 10 years, experience has been gained by the examination and certification of more than 1000 sleep medicine experts from more than 50 countries. The process h...