Deep sleep
01
深度睡眠, 沉睡
a stage of sleep where the body is fully relaxed, and the mind is less active, making it hard to wake up
例子
After a long day of work, he fell into a deep sleep and did n’t wake up until morning.
经过漫长的一天工作后，他陷入了深度睡眠，直到早上才醒来。
The baby was in a deep sleep, and nothing could disturb him.
婴儿处于深度睡眠中，没有什么能打扰他。
