How to get out of a block??

Lately, I have hit the biggest block of the year, I don't know if it's the weather or that my semester exams are going on, but I haven't done anything worthwhile in more than a week now. I feel guilty like hell but still, somedays, I sleep for over 10 hours! I am getting serious backlogs in classes as well.. What should I do?? How do I get out of it?? Please suggest something..!