Radzka, Agnieszka, Anna Mroczek, Urszula Fałkowska, Marta Pawlicka, Kamil Bałabuszek, and Halina Piecewicz-Szczęsna. 2018. “The Correlation Between Sleep Disorders and Obesity – Abnormal Sleep Duration As a Risk Factor for High Weight”. Journal of Education, Health and Sport 8 (7):305-12. https://apcz.umk.pl/JEHS/article/view/5672.