There is obviously no magic solution to this question but the best answer I know of is Socrates.

这个问题,没有神奇的解答,但我认为最佳的答案是苏格拉底。

耶鲁公开课 - 政治哲学导论课程节选

Probably the best answer is our body is worn out during the day and sleep is necessary to put it back into shape.

最佳的答案应该是,一天下来，我们的身体已经疲惫了,有必要进行睡眠，以恢复状态。

耶鲁公开课 - 心理学导论课程节选

And it may be that what we should conclude is, whatever the best answer to that question is, it's not the question we should really have been thinking about.

也许我们能得出的结论是，无论这问题最佳的答案是什么，这都不是我们最该考虑的问题。

耶鲁公开课 - 死亡课程节选