I just had the longest night of lucid dreaming two nights ago! It was crazy!

Not only did I become lucid three times in one night but they lasted ages! My best lucid experience ever!

Anyway, sometimes when I am asleep and suddenly become conscious and realise that I'm dreaming, the dream scene usually just turns completely black, and no matter how hard I visualise or command a scene to appear, nothing happens.

I was trying to think of everything I could do before it was too late, then I just remembered the FILD.

I did it and felt my hand go completely tingly. Then the tingling spread, straight to my legs. It got stronger and suddenly my FILDing hand just fell through my mattress. And I thought, "SHIT! FA!!" Opened my eyes and I was ready to do whatever I was able to!

Good luck.