get a good night's sleepAn encouraging or comforting way to tell someone to sleep well or get enough rest. 好好 means “properly” or “well,” and 一觉 refers to one uninterrupted period of sleep.
CH: 你今天太累了，早点回家好好睡一觉吧。
EN: You’re too tired today—go home early and get a good night's sleep.