Lawl, I had the same reaction.
However, I don't think I fully understand what you're explaining. Are you literally passing out in your lucids? If so, what happens when you come to? Are you still maintaining lucidity? If not, is it just the world around you that fades away? Or do you lose yourself?
It could be that your focusing too much of your attention inwards, on yourself, causing the dream to implode. However, from what I've read that usually ends in waking up.
Then again the very opposite could be true. You might be spending so much energy focusing on the world, and the people, and the minute details around you that, inevitably, you, yourself, cease to exist. My money is on this one.
Either way, the key is to find balance in where you focus your attention. I know, not very helpful.
This thread should help much more than I could hope to. The Cusp knows his stuff. I could find no fallacies within his proposed rules. I'm usually good at finding those, too.
Best of luck to you.
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