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I seem to have high dreaming sleep when I’ve spent long hours doing some sort of detailed, focused mental flow work (cf: a day doing CAD yesterday). It’s not physically exhausting like a day hiking, which seems to lead to dead, dreamless sleep. Anyone else notice this?
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More physical activity during the day leads to an increase in deep sleep at night, which is when most physical restoration happens. Mental restoration mostly happens during REM sleep, where dreaming is much more likely. This might explain what you are experiencing.
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People who spend hours looking through a scoped rifle report that as soon as they close their eyes they see through the cross-hairs. (And long-range riflery involved meticulous calculations and rapid feedback.)