What is goodnight and sweet dreams in the french language?

There are a few ways to say "goodnight and sweet dreams" in French, depending on the level of formality you want:

Formal:

* Bonne nuit et doux rêves. (This is the most literal translation.)

Informal:

* Bonne nuit et fais de beaux rêves. (This is a more common and friendly way to say it.)

* Dors bien! (This means "sleep well!" and is a common way to end a conversation before going to bed.)

* Fais de beaux rêves! (This means "have nice dreams!")

You can also use a combination of these phrases, for example:

* Bonne nuit, fais de beaux rêves!

Ultimately, the best way to say "goodnight and sweet dreams" in French will depend on your relationship with the person you are speaking to.