科勒曼说，而人有时在太累的情况下睡不着，却没有证据证明他们在不累的时候可以睡着。

While humans sometimes cannot sleep when tired, there is no evidence that they can sleep when they are not tired, Klerman explained.

youdao

我的感觉跟你一样，莫尔，简直是累死了，虽然身体并不累。

I feel just as you do, Mole; simply dead tired, though not body tired.

youdao

当我松土的时候，我一点也不累。

When I dig I'm not tired at all.

youdao

Or maybe you're working with your friend, and your friend is very overwhelmed

又或者你在跟你的朋友一起干活，你朋友累得实在坚持不下去了。

How about 课堂 - SpeakingMax英语口语达人