Siverfale
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Hint: a person enters a state of "deep" sleep after about an hour and a half. If the sleep is deep, you wake up heavily and feel sluggish all day (if you haven't slept enough, of course). If the sleep is not deep, then everything is more or less normal. So, it's better to sleep for an hour than to sleep for four.
Where do we go?
Where do we end up when we save the world?
Where do we end up when we save the world?