Exercise is the way to go man if you want a good nights sleep. Skip, ride a bike, weights, anything that will get you tired and relaxed before going to bed. Well that's what I find anyway. As soon as I hit the sack I was asleep before I knew it. Woke up at 6, skipped rope for 10 min, shower, breakfast, listen to music, then off to do my HSC at 8.30.
Was so calm and relaxed whilst still having all my knowledge. If you feel good there is no doubt you will perform better. I thought I went really well. I agree, it was much easier than I expected.