How do you say goodnight in Russian?

There are a few ways to say goodnight in Russian, depending on the level of formality and the context:

Formal:

* Спокойной ночи (Spokoynoy nochi) - This is the most common and formal way to say goodnight. It literally translates to "Peaceful night."

Informal:

* Доброй ночи (Dobroy nochi) - This is a more casual and friendly way to say goodnight. It literally translates to "Good night."

* Спать спокойно (Spat' spokoino) - This is a more intimate way to say goodnight, meaning "Sleep peacefully."

* Ладно, спокойной ночи (Ladno, spokoynoy nochi) - This is a more casual way to say goodnight, meaning "Okay, goodnight."

With loved ones:

* Сладких снов (Sladkikh snov) - This translates to "Sweet dreams."

* Я тебя люблю, спокойной ночи (Ya tebya lyublyu, spokoynoy nochi) - This translates to "I love you, goodnight."

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