当你的服务时间是在凌晨四点的时候，你不能只是在那里等着，像酒店的服务生那样期待着小费。

When your services are rendered at 4 a. m., you can't simply hang around, like a hotel bellboy expecting a tip.

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我们最后在凌晨四点左右上了床。

We finally went to bed at about 4am.

《柯林斯英汉双解大词典》

罗特麦耶小姐非常气愤地听从了召唤，因为此时才凌晨四点半。

Miss Rottenmeier obeyed the summons with the greatest indignation, for it was only half-past four in the morning.

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and then there's one eating club that's famous for being open until, like, four am,

有一家饮食俱乐部以营业到凌晨四点而出名。

有趣的吃东西协会 - SpeakingMax英语口语达人