What Am I?

You have no control over me,
I am not real, though sometimes you believe me,
I come back every night, but am often forgotten,
Though left alone, I will never become rotten,
Sometimes I remind you of things yet to come,
Sometimes, watching me, you do things you've never done,
I rarely ever turn out to be true,
Now I am done with this riddle for you.

What am I?

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