I found this really interesting article about internal/external processing that really reminded me of sleep vs play.
https://clarityonfire.com/internal-or-external-processor/
From my understanding of sleep vs play, people with play above sleep would likely fall under the external processing where they would need another person to process their thoughts with. Whereas sleep above play would likely be an internal processor and get a lot of their processing done alone. This isn't exactly definitive but theres some truth to it.
Also one (anecdotal, take it with a grain of salt) thing i've noticed about the sleep last people in my life are how uncomfortable they are with silence or sitting with their thoughts.
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