youdao

During stages three and four (often called "deep sleep") , it is very hard to wake up a person.

在第三和第四阶段（通常称为“深度睡眠”），这时唤醒一个人是很难的。

youdao

I'll wake up with my heart beating very hard and fast, and I'll be WIDE AWAKE.

我会在剧烈和快速的心跳中醒来，然后睡意全无。

youdao

Your eyes drift separately and slowly you're hard to wake up.

眼球运动时断时续，然后很慢,这种睡眠很难叫醒。

耶鲁公开课 - 心理学导论课程节选

Its hard to wake up during depressing times so wake me up pls.

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When I was young, my father used to give me a hard shake to wake me up.

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Logic and reality are not going to reach them, until they crash hard into it and wake up.

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