For three night in a row, 1-2 times per night, I've tried to use the FILD technique, but it failed every single time.

I move my fingers a bit, do a reality check, I'm awake. Go back to moving my fingers, do another reality che - wait a sec, it's time to wake up! Even though I move my fingers, I seem to always fall sleep anyways, and when I wake up I get really pissed off.

Anyone have tips/why I can't do it? I thought this was an easy technique to do.