@gregario as I said above

"a Technique to sorta "force" Lucid Dreaming would be Before going to bed write a mark on your hand something that is washable but clearly visible, and when you dream trying to look at your hands and noticing the marks either being gone or being there, the key point is the mark symbolises for you, that when you see it you are Dreaming! And this can instantly trigger you into a Lucid Dream."

This has a lot of possibility to trigger one. :)