I've never been a good sleeper at all! But when I had something on my mind such as exams, exams results, driving tests, and stuff likle that I lie awake for hours! I think you'll only get a good nights sleep if you clear your mind, easier said than done I know! Maybe have a hot bath with lavender, or read a book, or light some candles but make sure you put em out before oyu go to sleep! If all else fails and its seriously affecting your life, go and see a doctor, they might have more suggestions. Also, once you get yourt results and you've done fabulous, you'll probably sleep for a full 12 hours then wake up and get into a normal routine again!