gàn shí xiāo yī
天色很晚才吃饭，天不亮就穿衣起来。形容勤于政事
南朝 陈 徐陵《陈文帝哀策文》：“勤民听政，旰食宵衣。”
旰食宵衣作谓语、定语；指勤于政事。
getting up before dawn and eating late (busy with state affairs)
