Don't know how ridiculous it is, but I live in a Spanish speaking country, using English at work, consuming English part of the internet, occasionally using Russian during the day (because of Russian "refugees") and no one around me speaks my native language. There is a cognitive load.
I would think that the cognitive load is there because you are speaking a foreign language (whether one or many). I don't think it's debatable that speaking a foreign language day in day out with no one to speak your native language can wear you out.
