Get off your laptop/comp
It is like being outside in bright daylight, at least to your body.
http://stereopsis.com/flux/
any other pals use this tool? takes a bit to get used to but it is amazing to say the least.
This is amazing.
As far as getting yourself to sleep, think about all of the things that you need to do, but can't right now ecause its the middle of the night. If that doesn't work, think about how important it is that you fall asleep soon because of how tired you will be the next day. Look at the clock and calculate how many hours you have left to sleep before your alarm goes off, also, consider how long you have been lying in bed without sleeping. Ever wonder what it feels like to pass from consciousness to sleep? Focus on that as you lie in bed. Try to move around a lot, sometimes it takes a lot of tossing and turning to find the right sleeping position.
But honestly, a great method to helping sleep come that hasn't been mentioned yet is to try and squeeze out a good solid shit. If you can take a real good shit, something about it will put you to sleep. I've had insomnia cured on numerous occassions by walking to the bathroom and forcing a solid one out.