夙兴夜寐

Explanation: Su: Early; sleep soundly: to sleep. Get up early and stay up late. Described as hard-working. 　　Usage: Joint type; as predicate; with a compliment, for written language 　　Source: "Book of Songs Wei Feng Meng": "strive night and day, toward the extravagant there is carry on." 　　Examples: Ming Xu Zhonglin "Gods": "Gong Wei poor for several years, Keqin thrift, ~, Hegan light is helpful for me, Tim training with honor." Thesaurus:  day and night, toil night and day, pass from night to morning, travel or toil night and day, early to rise and late to bed, neglect one's meals and sleep, start work early and knock off late, round the clock, On Star with Phi, round the `clock all day and all night