Have you ever been in this situation before?
Its 5:00PM, 6 more hours before you'll collapse. Tomorrow, you'll have two exams that require super brain power (eg. physical geog and social studies). They are both important exams, and you know you have to study for it. But you just can't. You're not focused, you surf the net, you play your guitar, you do everything else besides studying, and at 11:00PM, you start panicking.

Let's say you've experienced the above situation before....