I think what iammoto means is that LaBerge proved that dream time usually behaves like WL time, but he didn’t (and I don’t think it can be proven) prove that it’s impossible to have longer dreams.
Well, that’s my view on it and what I got from:
Perhaps it’s possible to have longer dreams by accident or by will, maybe it’s just another LD skill
Ahem, back on topic though, I’ve had 4 or 5 FA one after another. It was annoying but nothing to freak you out and if you are lucid you can chose to wake up and lie still and all, like Kenty said above.
I haven’t gotten really really vivid LD’s eaither, but I think that kind of vividness naturally comes together with good lucidity, so it should be easier to simply know it’s a dream.