多少小时才是正确的睡眠时间呢？

What is the right amount?

youdao

只有正确的理解才能使你认识到去优化和加强你的睡眠系统，使你更有活力和更健康。

Only with the proper knowledge can you learn to optimize and strengthen your sleeping system, to have more energy and a higher level of health.

youdao

如果它是100%正确的，那我们经历的一天都将在我们的REM睡眠中被重新播放一遍呀！

If it were 100% correct, our entire day would be replayed to us during our REM sleep!

youdao