How to say Good night and sweet dreams in french?

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

Formal:

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

* Passez une bonne nuit et faites de beaux rêves. (This is a slightly more elaborate way to say it.)

Informal:

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

* Dors bien et fais de beaux rêves. (This is another informal option.)

Very informal:

* Bonne nuit et des bisous. (This literally means "Good night and kisses.")

You can choose the phrase that best suits the situation and your relationship with the person you are speaking to.