废寝忘食

Explanation: Waste: Stop. Refused to sleep, forget to eat. Described concentrate efforts. 　　Usage: Joint type; as predicate, attributive, adverbial; with compliment, hard to describe the people 　　Source: Southern King of Qi Rong, "Qushui Preface": "I still possessed out everything else, Jackson sundial forgotten meal." 　　Examples: Send a letter, but have a sound transmission, and save the people ~. (Yuan Zeng Ruiqing "left shoes in mind" the first break) 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, rise early in the morning and late, start work early and knock off late, round the clock, On Star with Phi, round the `clock all day and all night