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Technically, no. Because if your not sure as to whether its a dream or not, its not Lucid

There have been rare cases where people end up finding it difficult to tell the difference between reality and a dream, but that is more because of a literal mental problem rather then the dreams. Dreams would just be the path to it because of the problem.

I think thats what you meant is it not?

If you need anything just ask! Drop me a PM or ask around the boards. We'd be happy to help.