深夜 (shēn yè): очень поздно ночью

The hospital corridor was especially quiet late at night, with only the sound of the duty nurse's footsteps.

It was already twelve o'clock at night, and he was still in his study revising the report due tomorrow.

Mom can only get off work and come home late at night every day, but she never complains.

There was almost no one on the street late at night, and occasionally a taxi drove by.

He is used to writing late at night because it is quiet around him then, and his thoughts are clearer.