- 废寝忘食 [fèi qǐn wàng shí]
- lose sleep and forget to eat from anxiety, etc.; disregard meal times and go without sleep; do sth. almost to the gross neglect of one's health, losing sleep and weight; forget all about eating and sleeping; forget food and rest; forget one's sleep and meals; neglect one's sleep and meals; (He) skipped meals and sleep (when he was busy).; too busy to eat or sleep; work day and night, almostwithout eating or sleeping; work hard to the neglect of one's meals and sleep
The novel was so absorbing that she read on without a break even forgetting food and sleep.