How go you say ilove good night in french?

There isn't a direct translation of "I love good night" in French. It's best to express it in a more natural way, using two separate phrases:

* "Je t'aime. Bonne nuit." (Formal: "Je vous aime. Bonne nuit.") This is the most straightforward translation, meaning "I love you. Good night."

* "Je t'aime beaucoup. Dors bien." (Formal: "Je vous aime beaucoup. Dormez bien.") This translates to "I love you very much. Sleep well."

You could also use other romantic expressions:

* "Je t'adore. Passe une bonne nuit." (Formal: "Je vous adore. Passez une bonne nuit.") This means "I adore you. Have a good night."

* "Tu me manques déjà. Fais de beaux rêves." (Formal: "Vous me manquez déjà. Faites de beaux rêves.") This translates to "I already miss you. Have sweet dreams."

Ultimately, the best way to say it depends on the context and your relationship with the person.