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I heard about this idea and might give it a shot over the next few weeks.
The idea is that in your dream body, on one or both of your hands (Or anywhere, really - I just say hands because you tend to notice them first), you have some sort of 'tattoo' - a symbol of meaning to you. You can only see it when you're dreaming, so it can be used as a reality check to become lucid.
Has anybody done this before, and if so, had success?
How are you going to make sure the tattoo is there when dreaming? I suppose this works better when you draw the symbol IRL on your hands, and use a reality check (like plug your nose and breathe) each and every time you notice it. This symbol and habit might carry on in your dreams.
A tattoo only visible in your dreams AND use that are your sole RC might work, but I'm not very confident. Your subconscious will probably find some lame excuse why the symbol isn't out of the ordinary, thus you might not even notice.
Actually it's the same as the "hand checking" RC. Your body is almost every time somehow different in dream.