三更灯火五更鸡

Mandarin

simpl.		三更灯火五更鸡
trad.		三更燈火五更雞

Literally: by candle-light at the third watch, up with the chickens at the fifth watch

三更灯火五更鸡 (simplified, Pinyin sāngēng dēnghuǒ wǔgēng jī, traditional 三更燈火五更雞)

to burn the midnight oil, only to get up at the crack of dawn
to work long hours
to burn one's candle at both ends
- 2004: 武少民 (Wu Shaomin), 来信选登:素质教育比不上高考升学率？ (Letters to the Editor: Quality education cannot compare to the rate at which students pass high school entrance exams?)
  就是这样的一道槛，让众多的学子“三更灯火五更鸡”，让众多的学校加课补课取消节假日.
  It's just this kind of threshold that causes many students to study late into the night, only to get up and go to class the next morning. It also causes many schools to add extra classes, including make-up classes, and to cancel holidays and days off.