be dead to the world
陷入非常深入的睡眠状态，对外界刺激没有反应
口语·形容睡得很沉
英文释义
to be sound asleep or completely unaware and unresponsive to one's surroundings
例句
After the long hike, she was dead to the world and didn't hear the alarm.
典故来源
源自比喻，指人像死去一样对外界毫无反应，常形容深度睡眠或昏迷状态。