Now I've decided, based on a lot of criteria, that the best LD induction method for myself will be WILD/WBTB.

However, I've come to face a problem. I haven't seen this question asked or answered anywhere else before (sorry if I missed a topic...or two, heh) so I guess I'll ask it here and hope to get an answer.

What is hypnagogic imagery?
When you close your eyes and relax, lay there falling asleep will you literally see the imagery with your closed eyes or will it come in the form of conceptual thought?

I've been attempting WILDs for a short while but I'm not sure if I've ever seen hypnagogic imagery.
I've read that hypnagogic imagery appears on the brink of wakefullness and sleep, thus I suppose I need to stay aware for longer to see it or am I wrong and is hypnagogic imagery realized as conceptual thought that comes to one sooner than that?