If you find out how to motivate yourself, let me know. It's finals week and for the past hour, I've shopped around for Christmas gifts rather than writing my paper. Ever since I got those acceptances, it's been all downhill.
There isn't a trick to staying motivated. You just have to convince yourself to do what you have to. Thats it.
Its hard, I know. I'm abroad this semester, and havent been too motivated either. I'm taking a laughable course load compared to what I'd be doing at my home institution, yet I feel like I'm struggling to hand it all. I see your amotivation, and raise you a "would rather be sight seeing."
i've found that forcing yourself to study is usually a bad idea- you tend to not be as retentive with the data, and really make no effort to understand abstract/extremely laborious material. I believe that you have to cultivate in interest in the subject matter, whether it's genuinely for the subject itself or perhaps a secondary interest like your love of learning or caring about your gpa, to study smarter, and you'll find that it's much easier to study for something that you care about.
For instance, right now I'm taking genetics, which is the most boring class i can remember taking. It's all statistics, probabilities, equations, blah blah blah. But I view each chapter as a challenge of my abilities, and each problem as a roadblock on my way to getting an A. Hence, it motivates me to work out all those damn probabilities and stuff. It's a stupid mental construct, but it's been successful so far.
My cheap trick has always been study groups. Now, I know many premeds are lone studiers, and don't like study groups, but I love 'em. I find them to be very effective studying (plus, you can divvy up responsibility - like, you each read one section of a chapter and then teach it to the others), but most importantly, they actually get me to study in the first place. If I just try to sit down on my own and study, I guarantee you I'll get distracted and blow it off. But if I make a commitment to friends and/or classmates, there's no way that I'm not making it to that study group.
Caveat: you have to find the right people to study with. Some people just won't mesh with your style.
Oh, and kac714 - go Cubs! Here's hoping we get Jake Peavy.