sleep off 用睡觉消除（疲劳，痛苦）
They have been up all night and are sleeping it off.
When I have a headache, I always sleep the pain off.
【sleep off】PHRASAL VERB If you sleep off the effects of too much travelling, drink, or food, you recover from it by sleeping. / get rid of by sleeping 以睡眠消除 (不适)
It's a good idea to spend the first night of your holiday sleeping off the jet lag.
1. If you say that you didn't 【lose any sleep over】something, you mean that you did not worry about it at all. 担心
I didn't lose too much sleep over that investigation.
2. PHRASE If you are trying to make a decision and you say that you will 【sleep on it】, you mean that you will delay making a decision on it until the following day, so you have time to think about it. 把…留待以后解决
I need more time to sleep on it. It's a big decision and I want to make the right one.
3. PHRASE If a sick or injured animal is 【put to sleep】, it is killed by a vet in a way that does not cause it pain. 使 (有病或受伤的动物) 无痛苦地死去
I'm going take the dog down to the vet's and have her put to sleep.
4. PHRASE If you cannot 【get to sleep】, you are unable to sleep. 入睡
I can't get to sleep with all that singing.