Sleep Is Death without the Responsibility

"Sleep is death without the responsibility," but is sleep death, or at least how near to death is sleep? What is the point in sleep? What have we achieved after lying still for eight hours?
Is it an escape? Does sleep wrap you up in a little cocoon of well being which nothing can penetrate? Or is sleep a little taste of death? Is that why sleep can sometimes be such a terrifying thing? Are dreams in a way our heaven and hell? Some dreams give a sense of happiness and contentment, some just confuse, and some terrify to the point anything seems better than sleep.
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