我们凌晨五点就开始爬山了。

Wǒmen língchén wǔ diǎn jiù kāishǐ páshānle.

We started climbing the mountain at five in the morning.

凌晨的寒风让人感觉格外清新。

Língchén de hánfēng ràng rén gǎnjué géwài qīngxīn.

The cold wind in the early morning makes people feel exceptionally fresh.

我们凌晨赶飞机，所以很早就起床了。

Wǒmen língchén gǎn fēijī, suǒyǐ hěn zǎo jiù qǐchuángle.

We caught an early morning flight, so we got up very early.