I have heard on several occasions that the sign of fluency in a language is when one dreams in the language. That can’t be true. Or else I’m fluent in Arabic without being aware of it! I briefly studied Arabic but I don’t speak it. However, sometimes I have dreams in Arabic, or in what sounds like Arabic, in Arabic-speaking countries and I understand what is going on.
Polyglot dreaming: In which language do you dream?
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