Can we dream like this?

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We dream on various topics such as practical & or impractical matters. Someone gives us immense pleasure and someone not. Dreams can be beyond our imagination. But we cannot or never dream about our own death. Did anybody dream that he/she has died? I think it never happens. But what is the original reason of this fact? If everything can be dreamed, then why this difference stands for particular subject? Please explain your opinion my friends.