Kuchta, E., Wrzosek, K., Leśniak, M., Ponikowski, K., Kuchta, K., & Piecewicz-Szczęsna, H. (2026). Sleep Disturbances and Depression: A Narrative Review of the Bidirectional Relationship, Mechanisms, and the Role of Physical Activity. Quality in Sport, 63, 73039. https://doi.org/10.12775/QS.2026.63.73039