I was looking on the internet and I have found a method of making yourself relaxed enough to go to sleep quite quickly. All the times I've tried it have resulted in falling asleep rather quickly, however I havn't got around to trying to use it with WBTB.
It involves a few minutes of quiet relaxation before going to sleep to put you in the right frame of mind for sleeping in 6 steps.
Steps:

1) Lie down on your back in a dark room.

2) Close your eyes and try to focus on the shapes of light that you will “see” when your eyes are closed.

3) After a minute of focusing on those shapes, you should feel tranquil. At this point, raise your left arm at 45 degrees and hold it for a count of five. At the end of the count, forget that your arm is connected to your torso and just let gravity take control - your arm will drop to the mattress.

4) Next, raise your right arm, holding for a count of five and then releasing. Move on to your left leg, raising it 45 degrees in the air for a count of five, then release. Repeat for right leg.

5) The last step of relaxation is to remove all stress from your neck, which is a common part of your body that “bears the brunt” of your difficult day. Slowly raise your neck slightly off the mattress for a count of five, and then release and let gravity take hold.

6) Lying there, with your eyes closed, your entire body should feel completely at ease - almost weightless.[/b]
Try it, see what happens.