Impossible to WILD?

Hey guys, I have a question.

I've been able to have a few DEILDs as I've been trying to WILD and have lucid dreams since I became dedicated trying to (about a year and a half ago),
however I've never been able to WILD.

I've tried sleeping different amount of hours and waking to try it.
I've tried to WILD before any sleep, and even after 12 hours of sleep, but I just can't seem to WILD.

Is it possible that I just can't WILD? Does thinking about different things, but not falling asleep stop you from WILDing (even if it's been hours?)

I personally think that WILD has the most risk/reward. It needs (for some people) lots of time to learn, and then more to master. But once mastered, you can have lucid dreams every night, possibly even 2 or 3.