Practice useful French sentences together! In addition to sleep learning, I also recommend practicing in your car or living room. In this video, a female narrator reads French twice after English.
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Listening to other languages while you sleep help reinforce learning, a team of Swiss psychologists has found.
Despite only hearing the Dutch words in their sleep, the students that got some shut eye could remember the German translation better than the group forced to stay awake. — 30 June 2014 WIRED