Sleep refreshes and energizes us and restores our brain into top working order.

睡眠能够让我们精神焕发，让大脑恢复最佳工作状态。

So when you start removing too many of these top order predators you get an imbalance in the ecosystem.

所以, 当你开始去除太多这样的顶级捕食者生态系统就会变得不平衡。