"Good night" is the most common way to say "晚安" in English. It is a polite way to greet someone at the end of the day or to bid someone farewell. The phrase "good night" comes from the Old English "gode niht," which literally means "good night." Here are some examples of how to use "good night" in a sentence:

"Good night, sweet dreams." (晚宋，祝你做个好梦。)

"Good night, I'll see you tomorrow." (晚宋，明天见。)

"Good night, sleep tight." (晚宋，睡个好觉。)