You know it's finals week when....
... if you try to pull an all-nighter you have to pop stimulants like they're candy just so you don't pass out under your study carrel, but as soon as you want--no--need to sleep through the night, your thankless body decides that two hours of light sleep will do just fine, thank you, and what it really wants to do is toss and turn for the next nine hours.
Let it be known that in the case of "arson vs. studying" I rule wholeheartedly in favor of the former.... let the motherfuckers burn.