There have been very few studies on bilingualism and multilingualism and how they affect dreams. These are small studies, but they certainly find that people who speak any second language, even without good proficiency, at least occasionally dream in the second language. One study asked the subjects what they thought made the difference, and they said that it was determined by the people and or the setting that was being dreamed about. If you thought of your family back in your country of origin, it’d likely be in that language regardless of whether it was now your dominant language. And if you were dreaming about people you’ve known as a young adult, living in another setting where you spoke a different language, you’d be dreaming in that language. It was combination of where the dream was set, what language was associated with that, and what people were in the dream—that’s what they said determined it.
But I’ve heard others say that if they were dreaming about important emotional issues, they would dream in their original language, and if they were dreaming about practical, abstract, or work-related things, they would dream in their newer language. I heard something different from the most multilingual person I’ve ever talked to. He was a high-level Swedish economist, and he said that he was fluent in about 15 languages. He said that he dreamed in whatever language he was speaking that day, even if the dreams were about his family of origin in Sweden.
There is something that I have never seen mentioned in any of the published studies on this, which is that there are some people who say they are never aware of language in dreams—that they don’t dream in any particular language. I very much identify with that. Most of the time, I don’t hear language in my dreams. I have only a handful of times dreamed in a language other than English, which fits the findings of some studies that say that your degree of proficiency in a second language determines how often you will dream in it. I studied French in school, but I am not a proficient speaker. I’ve dreamed in French at least twice.
People who are not proficient in a foreign language sometimes say that they have once or more dreamed in the rudimentary second language, and in the dream, they believed they were very proficient in it. When people discuss it, it’s usually along the lines of “Why is it that we can be so much more fluent in our dreams?” Dream psychologists, especially neuroscientists, say that it’s likely because the prefrontal area that is responsible for reality checks is shut down. It is possible that they are more proficient in the dream, but it’s also possible that they feel more proficient in the dream because they’re not doing the usual self-judgment.
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