Hard decision: study vs play vs sleep?!?!?!

Managing time at its highest... Let's take an example(any resemblances to reality are pure imagination). Say its a Monday, evening to be more precise, you spent some 5 hours from 1pm to 6pm at work talking and doing some research, spend the whole morning in class feeling a little sick with a cold. You get home, feel very tired because of a long weekend where you didn't do a whole lot of studying, feel like taking a nap and actually go for it and take it.
You wake up, around 8pm, eat something, then realize that there is so much to read for tomorrow that you don't know where to start from. Should you do the readings in Leadership where every day you have a quiz and class participation? Should you read for Operations Management where it seems to be a hard class? Should you prepare for Marketing to keep up with the professor? Hm... Tough decision. Say you start reading Leadership and then, half way through the reading, someone comes and tells you that the schedule has changed and there is no Leadership for tomorrow. Even more, there is a lot to read for Global Economics instead.
OMG!!! It's already 9pm, you have so many things in your head, what to do first???

Operations Management seems to be ranked number 1 as priority so you start this but realize 1 hour and a half later that it requires more time than you've thought. So what do you do?
Then you find out there are more important things to think about and your head start spinning again. What do you do?

This moral dilemma has a simple answer: always when in doubt whether you should study or not... GO PLAY THEN GO TO BED!

But as I said, it's a hypothetical example, this can never happen in reality... so go ahead and study, study, study.