Yes, though sometimes it's unintelligible but still has the accent and feel of the language. My mother was French Canadian while alive and spoke only French while pregnant with me and also between her and her mother, my grandmother, until my age of 25. I also lived in a French town in New Brunswick, Canada until age five. I dreamed in French until my mother died 10 years ago. However, if I go to Paris and get brushed up on the language, I will begin to dream in French again for a while but then it stops. The longer I stayed in the English culture and lost touch with the language after my mom died, the more I began to dream in English only.