FILD = Finger Induced Lucid Dream, I believe 
I think the thing with FILD is to be very gentle. Whne you move your fingers you should move them very little, if I’m not mistaken. Almost like only sending tiny nervous impulses to the fingers so they only twitch a bit. And the RC also has to be gentle. You did the nose RC?
The point is, maybe you did fall asleep but didn’t realize it. Your body fell asleep, I mean. Your mind stayed awake and focused on your fingers. But I don’t know, try going here:
ld4all.com/forum/viewtopic.php?t … r=asc&&sta rt=90
I’m not experienced enough in FILD, so you might find more useful tips there
Give FILD a few more tries. And you can always try other techniques to see what works best for you!