Didn't beat my record :)?

Ok so I finally got some sleep. A whole 5.5 hours. Wow! I believe that the total time spent awake was about 50 hours. hmm what I want to know is why when I have a paper due the next day I cant keep my self awake even chugging caffeine and sugar but if I have nothing to do and nowhere to be I cant fall asleep? If you have the answer to that one let me know. O and my record for total awake time is...... 117 hours straight no naps. I will never take that pill again!