Subjects who instead imagined "a beach or a waterfall" were forced to expend more mental energy, and fell asleep faster than those asked to simply count sheep.

让实验者想像“瀑布”、“海滩”都会让他们脑力更加疲惫，结果就是他们比数绵羊的人睡着的更快。

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Any time we count on these external memory devices, we're taking away from the kind of mental cognitive processing that might help us actually remember that stuff on our own.

每当我们使用这些记忆设备时，就会减少自己的思想认知，从而不能帮助我们真正记住事物。

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There is growing evidence that the strength of a person's immune system is affected by his mental state, too: a healthy mind really does count, especially in an unhealthy body.

还有进一步证据显示，精神状态会影响一个人的免疫系统：心理健康十分重要，特别身体不健康的人。

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The founders were short of the minimum 500 residents to incorporate, so they added the 169 patients and employees of a local mental hospital to their count.

FORBES: City of Greed