Need to change the habit

Probably, I need to change the habit of keeping up at night. I started this at the very first of my student life. Probably, night was very silent for me to study and most of the time I used to do mathematics in night. After completing my SSC exam, something happened to me and I turned into a machine for study. It may be, because I did bad in SSC exam than I expected. I was supposed to be in first 3 of the college but I was far away. That made me very sticky to my determination and as a result, I found that I became 1st in 1st air final defeating the unbeaten boy Ahmed. From that time I started keeping up late and I remember I used to keep up late in my school life also and it is actually a part of my all styles and it would be hard for me to give up as I guess. Anyway, man can do everything as I believe. So, I should reduce the length of keeping up...I mean should sleep b4 4am. Lets see....