Many physiological and psychological processes fluctuate throughout the day in fairly stable, rhythmic patterns. The relationship between individual differences in circadian activity rhythms and a sense of time urgency were explored as well as a number of achievement-related variables. Undergraduates (N=308), whose circadian activity rhythms were assessed via Horne and Ostberg's Morningness-Eveningness Questionnaire, completed measures of achievement motivation, task orientation, and time urgency. Results indicated that "morning types" completed the questionnaires more quickly than others, expressed negative attitudes toward wasting time, and scored higher on measures of achievement tendency, task leadership, ambition, and introversion. Significant sex differences appeared on many of the morningness-eveningness correlates, i.e., males were more achievement-oriented, placed more value on being a leader, and were more adverse to wasting time; however, men and women did not differ on Morningness or Eveningness. Evidence suggests that individual differences in circadian activity rhythms are more than a component of task orientation, and that being a "morning type" in an achievement-oriented culture facilitates the development of achievement and time concerns. (Author/NRB)