Formal:
* 晚安 (wǎn ān): This is the most common and versatile phrase. It literally means "peaceful night".
* 祝您晚安 (zhù nín wǎn ān): This is a more polite and formal way to say "good night". It translates to "I wish you a peaceful night".
Informal:
* 睡了 (shuì le): This means "I'm going to sleep". It's more casual and often used among friends or family.
* 明天见 (míngtiān jiàn): This literally means "see you tomorrow". It's a common way to say good night to someone you'll see the next day.
In addition to the above, you can also use these phrases depending on the situation:
* 早点休息 (zǎo diǎn xiūxi): This means "rest early". It's appropriate for someone who needs to get up early the next day.
* 做个好梦 (zuò ge hǎo mèng): This means "have a good dream". It's a sweet and friendly way to say good night.
The best way to choose the right phrase is to consider who you're talking to and the context of the conversation.