You're probably thinking things too much, you just need to make yourself busy even it will take you a long time, Doing it will lessen your worries and somehow help you fall asleep. Just remember if you are lacking of sleep but it is hard for you to have it, then just be with it then ignore and make yourself busy. Just eat heavy meals if you really didn't get the sleep you need to sustain you with your work/tasks. I don't recommend you trying pills, because it will just make you dependent to it. Natural processes will do, such as doing exercises during morning, avoiding day naps, eating foods that are rich in Melatonin from Pineapples, Bananas, Oranges, ... and avoiding caffeine from Soda, Coffee, and so on. PM me if you want a deeper explanation about this issue.