My dreams usually end by fading away. The dream scene would slowly turn dark or the colors become less vivid until I finally wake up. Some dreams also end dramatically. Some are abrupt, where you just suddenly wake up, and even more dramatic ones where the dream scene shatters like glass. There are many ways dreams end, i think it's different for everyone, and it sometimes depends on the kind of dream you were having.
But yes, using autosuggestion to catch your dream fading is a nice idea for attaining lucidity. However, it might be harder to stay in the dream. What I mean is, since you are naturally ending a dream cycle and starting to wake up, if you successfully catch it and become lucid, it might be a bit hard to prolong the dream. But you can, of course as you stated, use it for DEILDs. So either way, you get something out of it!
You can use any autosuggestion, as long as it is meaningful to you, and it really reminds you of your goal.
Good luck.
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