Background & objectives:Circadian rhythm or chronotype is a study of individual’s predilection to exhibit morning or evening trait in organizing various behavioral & daily activities in a 24 hour period. Morning chronotype individuals are those who likes early morning awakening where as evening chronotype individuals prefer getting late in morning and stay awake late later at night time. Therefore, this study was designed to estimatemorningness-eveningness preferencesto perform the day to day activities among medical students. Materials & Methods:This is a cross sectional study done among 244 medical students of Chamarajanagar Institute of medical students, Karnataka. All the study participants were administered Horne-ÖstbergMorningness-Eveningness Questionnaire. The obtained data regarding the chronotype preferences was expressed in percentage. The association among the study variables was determined using student t test and Chi-square test. p value <0.05 considered significant. Results:Majority of the students (171) almost 70% belong to neither type chronotype. Almost 55.7 %( 136) prefer to go to bed between 10:15 PM – 12:30 AM. 115 students find themselves fairly alert during the first half after they woke up in the morning and 57.7% students felt fairly refreshed during the first half hour after they woke up from sleep.Boys show increased dependency on alarm to get up at specific time than girls. Conclusion:In this study, majority of the study subjects belonged to neither type. Boys showed a higher dependency on the alarm for getting up at specific timing than girls. Girls preferred early morning hours for a physical and mental exhausting work than boys who preferred later hours.