Depth Is Not Vividness
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Sleep depth is measured by how hard a sleeper is to wake, not by how rich the experience during that stage is.
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A sleeper in slow-wave sleep is disoriented for minutes on waking and reports almost nothing.
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Depth and subjective richness run in opposite directions across the night, which is why the two get swapped.
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