There is not much support for these. One theory which is popular is that

对于这些理论没有太多的支持证据其中一个主流理论认为
dreams are a side effect of memory consolidation so your body,

梦是巩固记忆的副作用你的身体
sort of below the neck, rebuilds itself while you're sleeping

脖子以下的部分在睡觉的时候会自我恢复
but also what happens while you're sleeping

另外在睡觉的时候会发生的是
is your memories get played over and over again

你的记忆一次又一次地重复播放
to consolidate them into different parts of the brain.

把它们巩固到大脑的不同部分
Almost--the best analogy here is backing up a computer.

这里最好的比方是备份电脑
Your brain backs itself up. In the course of backing itself up,

你的大脑会自动备份在备份的过程中
there are sort of random events flash to consciousness

会出现一系列的随机事件在意识中闪现
and get put together in a coherent story. From this perspective,

然后这些事件整合成一个连贯完整的故事从这个观点来看
dreams serve no adaptive function at all but rather they're epiphenomena.

梦完全不具备适应功能相反它们是副现象
They are the byproducts of another system.

它们是另外一个系统的副产物