三更灯火五更鸡 (三更燈火五更雞) sān gēng dēng huǒ wǔ gèng jī

sān gēng dēng huǒ wǔ gèng jī set phrase go to sleep late and get up early
Domain: Proverb 谚语
Notes: A simile for working hard (Guoyu '三更燈火五更雞')