I once found instructions that promised to lead to lucid dreaming. After following the process for sometime, which included frequently questioning my awake state with “am I dreaming?” and finding patterns to recognize the difference, I awoke one night to find a multi colored scorpion-esque creature about the size of my foot crawling on the side of my bed. I stared at it in disbelief and then jumped up to turn on the light. Of course, it was gone – I was only dreaming while awake. Had it worked?
[Either way...I never wanted to try it again.]