Trying to get motivated...but extra lazy?

I just came off a winter break and I have already started my Spring semester in college. I have been feeling really tired and completely unmotivated. After I bought all my overpriced textbooks I just look at the pile of books and sigh in disgust. I don't remember feeling this awful when I started my other semesters. How can I get back into the "school mode" again? Any thoughts, tips, insight?