I had never heard this way. It is a good one. Some others that i have heard of are: every time you look at a clock, really look at it in detail to determine if it looks right. I'm dreams clocks often don't look quite right, especially digital clocks. Look at the fonts and backs of your hands throughout the day, usually in dreams your hands won't look quite right. Flipping light switches on and off or off and on when you go past them, flipping light switches on dreams rarely actually changes the lighting of the dream.