深夜 (shēn yè): Very late at night (Noun) — Meaning & Stroke Order

He studied diligently until late at night.

The noise late at night disturbed the neighbors' rest.

She can't stand working overtime until late at night every day, so she decided to change jobs.

The alarm sound in the middle of the night alarmed the residents who were resting.

Facing the urgent deadline, he worked overtime until late at night to finish the report.