Sleep, as ancient maps once labeled uncharted territories, is where the dragons be. The human brain is a loud and messy and stormy place. We spend our days in a sensory typhoon, buffeted by sights and sounds and experiences, and all that time the brain's prefrontal cortex keeps order: focus here, tend to that, ignore the rest. But at night, the prefrontal punches out--and the crazy begins to stir.
To go to sleep is to enter a world entirely like our own and entirely unlike it too. You can board a plane that's really a car that flies to Russia, except...
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