The 3rd Edition of the ESRS Sleep Science School held 26 September to 1 October, 2021 was the first in-person ESRS gathering since the start of the COVID-19 pandemic in 2020. In spite of the uncertainty about travel restrictions and safety procedures, the school proceeded as scheduled, and boasted 40 participants from 16 different countries and a faculty of 8, and was organized by ESRS President Dr. Pierre-Hervé Luppi (FR), Vice President (Basic) Dr. Tom DeBoer (NL), and Past President Prof. Dr. Philippe Peigneux (BE). Other faculty included Vladyslav Vyazovskiy (UK), Monika Schönauer (DE), Iben Lundgaard (SE), Maria Robles (DE) and Gabrielle Girardeau (FR), all of whose lectures are presented here.
