All three incidents occurred in the dead of night.

3起事件都发生在深夜。

《柯林斯英汉双解大词典》

I crept out of bed in the dead of night and sneaked downstairs.

深夜我悄悄地从床上爬起来，蹑手蹑脚地下了楼。

《牛津词典》

Or that time in the deep Ozarks when someone spent several hours intermittently knocking on my door in the dead of night.

还有一次，远在小城欧萨克，夜晚静悄悄的，有人过一段时间就来敲打我的房门，一连持续了几个小时。

youdao

And now at the dead hour of the night, in the horrible silence of that old house, so strange a noise as this excited me to uncontrollable terror.

VOA: special.2009.05.16

Nick Ramos, walking the streets in the dead of night alongside the Iraqi police.

CNN: Iraqi forces now calling the shots

The Israeli army still regularly escorts Jewish pilgrims here in the dead of night.

BBC: Part II: The road to Bethlehem

In the dead of night, the Transportation Security Administration (TSA) administratively reclassified airport security screeners as Transportation Security Officers.

FORBES: The TSA Is Coming To A Highway Near You