I can't do wake back to bed at 4am with this experiment since last time I tried that I lay awake for 3 hours straight and it was hell...
Yet you want participants to stay awake all night without moving? lol

It's not impossible, but highly unlikely that one will get into a lucid dream by a WILD at the begining of the night, as one must have deep sleep with little to no REM for a few hours before getting into the dreaming states, which is why waking up after so many hours then performing a WILD, works.

I have had experiences similair to yours. By remaining aware whilst falling asleep, the body can go into sleep paralysis, but it wants to go to sleep, not dream, which is why usually, nothing much else happens.

If you never get to sleep that's no problem... With that attitude your on your way to some interesting results!
?

Keep in mind that any strain (open mouth or swallowing) tells your body to stay awake... You want it to fall asleep while keeping your mind awake.
Lie in a position which avoids strain on any muscles (have mouth slightly open)
Lol?

Ok so it's a traditional WILD then, but at the beginning of the night, which is like 95% bound to fail.. ?

Sorry but I don't really see this as a technique, it sounds like torture.