That's what happens to me. I get somewhere with WILD if I combine it with a WBTB.

But I as well would like to master the WILD for the afternoon. Some do it, so it's not impossible.

What you need to do is first calm yourself down and bring yourself to a state of near-sleep. You can't be riled up at all or be nervous or excited in the slightest. After that, you need to find a technique that both keeps you awake and doesn't let your attention wander too much.

My problem is I either stay at it too long getting nowhere or I end up losing consciousness when I end up trying it in the afternoon. Needless to say, I haven't figured out how to do what I outlined above, but I have figured out what I need to do. I hope it helps.