Weird Habit

I have this weird habit that everytime I have alot of things to do, I just leave everything and go to bed. The bigger problem is that now I have exams. I was supposed to start studying from Wednesday, but again, instead, I fell asleep. I get so nervous around exams that I dont want to do anything. I dont know why though. I mean I've attended the classes, understood what the Drs have said, done my homeworks but then again I get so freaking nervous when the exams are here. I know its stupid, but I really don't know what to do. I wish you all the best of luck in your exams, and for me, I just wish that I would actually open a book and study.