The relationship between morningness-eveningness, age, sex, anxiety trait and sports modality among adolescent athletes was studied. 102 high performance young Spanish athletes (54 woman and 48 men) between 14 and 17 years old participated in this study. Morningness-Eveningness was measured by the Composite Scale Morningness-Eveningness (CS) and anxiety trait was measured by the State-Trait Anxiety Inventory (STAI). The results indicate that there is no relationship between chronotype, age, sex and anxiety of athletes, as these are more morningness than the general population of adolescents; and sprinters / hurdlers are more eveningness than other modalities. We conclude that high sports performance may be an external Zeitzbergs amending psychological, physiological and biochemical aspects of youth. morningness, eveningness, sport performance, Zeitzbergs.