他们认识到睡眠分为五个阶段。

They have learned that there are five stages of sleep.

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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.

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我们对于睡眠模式基本上有两种主要的认识。

It seems there are two main schools of thought about sleep patterns.

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