What are you doing while you are just lying there? Are you just lying there thinking about different things? I would at least focus on some kind of anchor, and hopefully one that allows you to fall asleep. Different folks here do different things: repeating a mantra to themselves (which I don't do, so they will need to explain that), visualizing your next dream scene, focusing on a visualization (beads of light in the forehead, throat, or chest are common), or focusing on your body.
The reason the HI began is because you relaxed and decided to go to sleep. WILD won't happen if your body doesn't fall asleep, so you may just be keeping yourself awake. You want to be in between the two extremes of total wakefulness and total unconscious sleep. Helpful links:
WILD
http://www.dreamviews.com/wake-initi...ild-guide.html