夜よ更ふかし

noun, noun or participle which takes 'suru', intransitive verb

staying up late; keeping late hours

Commonly used as a noun or with する to describe intentionally staying awake late into the night, often for leisure or work.

• 昨さく夜やは夜よ更ふかしして、朝あさ起おきるのがつらかった。

  I stayed up late last night and had a hard time waking up in the morning.

• 試し験けん前まえはいつも夜よ更ふかし