I usually try to wake myself up after doing a bunch of things in a lucid dream. Even though it probably shortens it, it helps me remember it (especially in the early REM stages). Once in a lucid, I got "It's breakfeast time" temporarily in my vision, with a picture of a spoon and eggs lol. My dream self thought of it as my lucid dream being 1/3 over, but it actually came near the end of the lucid dream.