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.

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.

凌晨的星空格外美丽。

Língchén de xīngkōng géwài měilì.

The early morning sky is exceptionally beautiful with stars.