I feel I was so damn close to having a lucid dream — it would have been my first.

I tried the Wake Induced Lucid Dream (WILD) method; so my body was asleep and a scene started playing for me. I was in first person view and flying around an island. I was flying along the coast and was kind of half in and half out of the water and doing a circuit of the island's coast. I thought "Wow I'm so close!" then the effect was lost.
Since then I haven't been able to sleep (even after dumping 400mg of Valerian Root) and have a sort of lucid dreamer's blue balls! Frustrating!

I think I might be focusing too much on the WILD. When I clear my head, and attempt to let the darkness of my eyelids wash over me, I feel closer to being able to transition. But my mind often to wanders when I'm attempting to WILD, even if I'm tired and have dumped some Valerian. But what's worse is that even when my mind doesn't wander I can't seem to nod off to sleep, let alone transition into a WILD.
I'm beginning to think I simply can't sleep on my back — I normally sleep on my side or stomach.

Has anyone been able to WILD on their stomach and can I get a general idea of people's opinions, thoughts and feelings on what seems to be a rather large hurdle for me?

Thanks in advance.