然而，要是将自己的意志力视为取之不尽的资源，人们反而会变得精力充沛。

However, people who view their willpower as a limitless resource get energized instead.

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Maud姨妈也因此有了兴致并变得精力充沛了。

Aunt Maud, too, revived as this and became quite energetic.

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如果你想变得精力充沛、头脑清醒，就睡20分钟吧。

Aim for about 20 minutes if you want a boost in energy and mental alertness.

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