I vote for SSILD.
It is a form of WBTB. You relax, so you can go back to sleep, but you are thinking about your senses. This isn't a substantial enough thought to keep you awake, but it keeps you awake enough that you may feel yourself slip into a dream. Even if not, it supposedly helps you become lucid after falling asleep.

I can't say definitively that it has worked for me, but when I started the technique, I went gangbusters as compared to a 2 year history I had experienced to that point. When I stopped using the technique diligently, my success went off a cliff. I consider this anecdotal evidence, but it is the technique I use.