The body needs very little sleep, if any.
It's the brain that needs the sleep.
If you don't get the right sleep, you won't be thinking as well as when you do get the right sleep.
1. stay away from electronic devices as much as you can - reading from an ipad or computer can actually increase your allertness and inability to sleep by a large factor - it has to do with the images not being "precise" and the brain having to "form" the images - as oppose to reading from a book or paper
2. read a good, but not too engrossing book - light reading, but something you enjoy - but be sure it's a printed book - ebook like kindles come very very close, and can be used, but an ipad or a computer will actually excite the chemicals in your brain rather than relax them - read until you fall asleep
3. drink some warm milk, avoid alcohol or caffeine or sugary drinks
you need to calm your mind, and once you do, you'll find that you can rest your mind, even if you can't sleep.