How do you say Sweet dreams and good night in french?

There are a couple of ways to say "Sweet dreams and good night" in French, depending on how formal you want to be:

Formal:

* "Faites de beaux rêves et bonne nuit." (This is the most literal translation and the most formal way to say it.)

Informal:

* "Fais de beaux rêves et bonne nuit." (This is a more informal version using the singular "Fais" instead of "Faites".)

* "Dors bien et bonne nuit." (This literally translates to "Sleep well and good night." It's a more casual and common way to say it.)

You can also just say "Bonne nuit" (good night) and it's perfectly understood.