MIERNICZEK, Aleksandra, CHODÓR, Michalina, KOKOSZKA, Maciej, TOMASZEWSKA, Aleksandra, KARCZEWSKA, Kinga, ĆWIRKO-GODYCKA, Aleksandra, MURAWSKA, Nikola, DYMEL, Natalia, FERET, Ryszard and MOJZYK, Sonia. Melatonin deficiency and sleep fragmentation in frequent travelers: A modern circadian health crisis. Journal of Education, Health and Sport. Online. 22 December 2025. Vol. 86, p. 66950. [Accessed 23 December 2025]. DOI 10.12775/JEHS.2025.86.66950.