Maximize your sleeping!

There are important lessons on being realistic and time management. Getting enough sleep is another lesson. Most of the college students I know get 4-6 hours. I think that people around this age are supposed to get 8-10 hours of sleep.

If you know that you prefer staying up late at night (as most college students are night owls), then schedule your courses so that you don't have morning classes. If you aspire to do extraordinarily well, throw away your night life during the week and force yourself to become a morning person. Morning people usually need lots and lots of (ok fine. I exaggerate. enough) sleep. You wake up refreshed and ready to tackle the homework you didn't do the night before.

Go to sleep when you are tired. To avoid all nighters, try not to procrastinate too much. :)

Lack of sleep leads to terrible things like : grumpiness, people telling you that you're PMSing, quick to anger, and dark circles under your eyes. If I wanted to sound like your mom, it also de-optimizes your immune system.

Anyways, sleeping is a fabulous thing. Do it justice so that you can wake up feeling great.