In which language do people who speak at least two languages as fluently as their native tongue speak in their dreams?

In which language do people who speak at least two languages as fluently as their native tongue speak in their dreams?
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I asked someone who speaks two native languages, Hausa and English, and they explained that in their dreams, they speak Hausa when they see family or relatives and switch to English when they encounter anyone else. They mentioned there’s no definitive answer to this—it varies from person to person.
In which language do people who speak at least two languages as fluently as their native tongue speak in their dreams?
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