下列何者不是避免做恶梦的小诀窍？

Which of the following is NOT a tip on avoiding nightmares?

youdao

现在我们为你呈现另外九个能延长你本本使用寿命的小诀窍。

We're back with nine additional tips that should make your laptop live just a little bit longer.

youdao

很多时候，一个新床垫可能就是你在夜间得到更好休息的小诀窍。

Often times just buying a new mattress can be the secret to getting a better night's rest.

youdao

It is internet accessible so you can access it most anywhere anytime and you can also access tools and software and tricks that the staff have made available.

而且可以通过网络访问,所以无论何时何地都能访问,你们也可以访问这些工具啊，软件啊，还有一些,授权访问的小诀窍。

哈佛公开课 - 计算机科学课程节选