"没日没夜"是个多义词，它可以指没日没夜（汉语成语）,没日没夜（郭聪明演唱歌曲）。
他在家没日没夜的刻苦学习，都快得幽闭症了。
He studies so hard at home day and night that he seems to have cabin fever.
仅仅是在纸堆里面没日没夜的工作是不能帮你得到晋升的。
Just being buried under piles of paper day and night is not enough for you to get promoted.
一直没日没夜地在宿舍工作，创建这个电子商务系统。
and preceded to work night and day for my dorm rooms, and built this e-commerce system.
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