How do I say good night and love you in french?

There are a few ways to say "good night and love you" in French, depending on the level of formality and the context:

Formal:

* Bonne nuit et je vous aime (This is the most formal way to say it, suitable for someone you respect greatly.)

Informal:

* Bonne nuit et je t'aime (This is a more casual and affectionate way to say it, suitable for close friends, family members, or a significant other.)

* Dors bien et je t'aime (This means "Sleep well and I love you.")

* Bonne nuit mon amour / ma chérie / mon chéri (This means "Good night my love" and is very affectionate.)

You can also combine these phrases:

* Bonne nuit, je t'aime beaucoup (Good night, I love you very much)

* Dors bien mon amour, je t'aime (Sleep well my love, I love you)

The best way to choose the right phrase depends on the person you are talking to and the context of the conversation.