Good night then.

那么就祝你晚安吧。

youdao

Good night then. I will wake you in the morning.

那么祝你晚安。早上我去叫醒你。

youdao

"Good night, then," she said abruptly.

“那么，晚安”，她唐突地说道。

《柯林斯英汉双解大词典》

I was never no good after that night,Charley. It was like a peak you reach, and then it's downhill."

VOA: special.2009.11.30

Then she said good night, stopped in her study to check her e-mail, and went into the bathroom.

NEWYORKER: Brooklyn Circle

Sixth seed Andy Roddick then completed a good night for the Americans by beating Sweden's Thomas Enqvist 6-4 6-4.

BBC: Hewitt back from the brink

Then she wished me good night.

NEWYORKER: Up All Night