They had a good sleep of a few hours without their noticing it, until the east was already beginning to grow bright.

他们睡了好几个小时，不知不觉，东方已破晓了。

《新英汉大辞典》

I didn’t wake up until 4am the next day, and it felt like I was in a deep, dreamless sleep.

结果直到第二天早上4点我才醒过来。 感觉这是一次很沉的几乎无梦的睡眠。

youdao

Unlocking the mutex happens immediately, but waiting on the condition mycond is normally a blocking operation, meaning that our thread will go to sleep, consuming no CPU cycles until it is woken up.

对互斥对象解锁会立即发生，但等待条件mycond通常是一个阻塞操作，这意味着线程将睡眠，在它苏醒之前不会消耗CPU周期。

youdao

It was nighttime by that point, so decided to sleep on it and wait until morning to really try them on.

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Some patients with any abnormality "can't sleep at night until something's done about it, " he said.

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They can take it off when they take a shower but they wear it for the rest of the day until they go to sleep.

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