Replay Your Day
This is a great technique that will not only help you fall asleep, but will improve your memory recall as well.
It involves replaying your day, much like the Movie Rewind technique, but the difference is that you are recalling your day in chronological order. From the moment you woke up from bed that morning, your mind will go one step at a time, remembering what you did to get from point A to point B to where you are now (in bed).
You will recall the conversations you had, what actions you performed, and every other detail that you can remember leading up to this moment.
By the time you reach the evening in your "replay of the day", you will likely fall asleep due to the mind giving up and no longer being able to sustain much interest.
Replay Your Day (Step-By-Step):
Turn off or dim the lights in the room. Remove any noise distractions.
Get in bed and lie down with your eyes closed.
Begin by visualizing the moment you woke up from bed this morning.
Perhaps you woke up due to the alarm clock going off. Try and see this visually in your mind.
Continue seeing yourself going to the shower, doing everything in chronological order, until you reach the moment where you are in bed right at this moment.
Chances are that if you make it to the end of the day without falling asleep, your mind will be pretty tired anyway from this tedious mental exercise. After which, you probably won't have much trouble just falling asleep by lying there with your eyes closed.
However, if all else fails, you can do the process all over again...but start replaying yesterday instead.