Hello and welcome to DV. Dream Signs aren't intended to be reality-checked while already being lucid so to speak. If you RC to your dream sign in a habitual manner you will most likely do it as you are dreaming, as soon as you see your dream sign you will question the situation and then do a RC and become lucid! Always keep a journal and always spot your dream signs, don't worry you will be off to lucidland in no time!