My family emigrated to the States when I was 11 years old, from Argentina. I’m a native Spanish speaker and, when I arrived in the U.S., I spoke barely a few words of English. We arrived in early May, so after 2 months of 5th grade I was let out of school for the summer and, in the two months that followed, I learned how to speak English.
I think it was during that summer that I stopped dreaming in Spanish and began dreaming in English. As I recall, the change was more abrupt than gradual: in other words, one night I dreamed in my native tongue, the next in English, as though it’d been that way always.
Has this happened the same way for other non-native English speakers? I’ve asked my brothers about their experience, but they have no recollection of the exact moment it happened to them.