Objective: The aim of this paper was to test how sport participation and chronotype affect objectively measured sleep timing parameters on workdays.
Material and methods: The sample included 82 student athletes and 40 non-athletes who completed three-day wrist actigraphy monitoring and the Polish version of the Morningness-Eveningness Questionnaire.
Results: Eveningness predicted later timing of falling asleep and mid-sleep, but not the wake-up time. Student athletes had earlier wake-up time and shorter sleep duration than non-athletes.
Discussion: The results support the view that university students suffer insufficient sleep, especially those participating in extensive sport activity.
Keywords: Actigraphy; Athletes; Circadian Rhythm; Sleep; Students.