What is dream??

    Every human dream. What is dream?? Why do we dream?? I don't know, but I have some opinions. I think dream is just past memory we experienced and thouht because we don't make anything we don't know. If you experienced dream you don't know, I think you can't remember. Brain alway remember anything, and sometime brain remeber information you can't search.
    Finally, I think dream is just thing you remember during sleep. But I don't know what dream is appear. I think anything I don't know is.