Staying up all night; spending the entire night awake (often due to work, study, or urgent matters).
試験前は徹夜して勉強したが、十分に休んだ方が効果的だ。
I pulled an all-nighter studying before the exam, but getting enough rest is more effective.
徹夜明けで顔色が悪い。
He looks pale after staying up all night.
納期が迫っているのでチームで徹夜した。
The deadline was near, so the team worked through the night.