Kędzia, Piotr. “Around Training Pro-Health Behaviours of People Leading an Active Lifestyle. Sleep As a Natural Way of Regeneration”. In Contemporary Problems of Physical and Health Culture, edited by Jolanta Elżbieta Kowalska, Anna Makarczuk, Anna Maszorek-Szymala, and Arkadiusz Kaźmierczak, 157–164. Poland: Lodz University Press, 2022. Accessed February 7, 2026. https://press.uni.lodz.pl/index.php/wul/catalog/book/1255/chapter/3624.