In fact, I can even use your appearance to describe it! Alright, here's the situation. You have an exam to sit for the next day, and you haven't prepared at all, and I mean at all! You browse through the chapters to cover and say to yourself, "Damn, 3 chapters... I can do this!", and you proceed to pour over the pages with the fluorescent light over the ceiling the entire night. Needless to say, most exams are scheduled during the early mornings, so you decide to skip precious sleep because by the time you are done, it would've been 5 in the morning. 3 more hours to the paper, "I'd better go get some coffee...".
Next thing you know, you are in uni/college, and you meet up with some friends. They gave an exclamation, "Man... did you not get enough sleep last night? You look like an 'Ailuropoda melanoleuca'. In short.....
Now let's see... pandas are cute aren't they? They are lazy, sleepy-looking most of the time, constantly eating.... darn, is that how we define cute anyway? By the way, has anyone seen Linx looking like a panda? I have, and there's even a photograph it!! Let's see, perhaps I am able to scan it once I get home and post it here... you liked her drawings, didn't you? Then you'd like her panda pic!!Well, I'm sure she'd say I am the panda, not her. But if I were a panda, I'd look like this:

Doesn't this just remind of Saotome Genma from Ranma 1/2?
That was only the 1st, there a few more to come as we pursued perfection in our drawings, but to no avail as the subsequent ones weren't any better, but perhaps a little more normal looking:
:D 