Psychology / Unit 3 Psych 0320 short lesson, about 20 seconds
Depth Is Not Vividness
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The idea
Sleep depth is measured by how hard a sleeper is to wake, not by how rich the experience during that stage is.
In practice
A sleeper in slow-wave sleep is disoriented for minutes on waking and reports almost nothing.
Where people slip
Depth and subjective richness run in opposite directions across the night, which is why the two get swapped.
Your place on the trail
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Unlocks
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