It is usually “Good night.” This is absolutely good and correct. However, non-native English speakers would say that too much, which sounds boring to natives. So you need to paraphrase, or use different expression.
One of the different expression is “See you in the morning.” The meaning is the same as “Good night.” Instead, “See you in the morning.”is used when you meet the person the next morning. That is the difference between the two.
You can say both now, and it may help you look more sophisticated than before.
This is today's tiny lesson.OK every one? Good night!
