I'm more inclined to believe that the mind probes the body, not the other way around. I believe this is done consciously during a WILD. Otherwise, why do we fall asleep every night when our body still moves?

It's not necessary for the body to be completely still prior to WILD. Sleep paralysis ensures this. I doubt anti-dream signals will be produced from a swallow or from satisfying an itch. Flailing your arms, maybe, but not flicking a finger.