How do you say goodnight sweetheart in Russian?

There are a few ways to say "goodnight sweetheart" in Russian, depending on the level of formality and endearment you want to convey:

Formal:

* Спокойной ночи, дорогая/дорогой (Spokoynoy nochi, dorogaya/dorogoy) - This translates literally to "Good night, dear/darling." This is the most polite option and appropriate for a more formal setting.

Informal:

* Спокойной ночи, любимая/любимый (Spokoynoy nochi, lyubimaya/lyubimy) - This translates to "Good night, beloved/beloved." This is more intimate and suitable for close relationships.

* Доброй ночи, милая/милый (Dobroy nochi, milaa/mily) - This translates to "Good night, sweet/dear." This is also informal and affectionate.

* Спокойной ночи, солнышко/солнышко (Spokoynoy nochi, solnyshko/solnyshko) - This translates to "Good night, sunshine." This is a very affectionate and playful option.

You can also add a personal touch to your message, such as "Сладких снов" (Sladkih snov) which means "Sweet dreams."

Remember: The best way to choose the right expression depends on your relationship with the person and the context of the conversation.