I had two lucid dreams (out of 4) this past morning. They weren't very long/vivid, but I found a good way to predict dreamsigns (maybe a good heuristic for reality checking):

I find that every element that appears in a dream of mine, some way or the other, is something that I've seen recently. E.g. My gf works with rats in a lab, and she showed me the lab just yesterday... and one of my dreams this morning had those similar rats in it. So next time you see something that isn't 100% part of your routine, you can try telling yourself that you'll do a RC next time you see something like that... Worked twice in a row this morning .