TY JOUR TI Features of somnological characteristics of athletes specializing in the discipline of triathlon with cross-country skiing in the aspect of sexual dimorphism KW polyathlon KW sports somnology KW adaptation KW sexual dimorphism KW acoustic sleep registration JO Scientific notes of P. F. Lesgaft University AU Petrov, A.B. AU Kotova, A.S. AU Zhevanov, V.V. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft