Cars aren't 100% airtight, but there is essentially zero circulation while parked. Over the course of sleeping for ~7 hours your breath will humidify the air enough to build up pretty significant moisture on the insides of your windows. Which if the reflectx cutouts in every window didn't give away, definitely let's passersby know theres a person in there.
So to mitigate against that and not wake up sweaty in a super muggy car, I buy these little things at the dollar store that are essentially plastic cups with a one way moisture membrane over the top of them and several ounces of silica desicant.
I also made a foam board cutout thing that slots into the sunroof space in the headliner. Then made cutouts for two USB fans (intake and exhaust) that I run off a 20,000mah USB battery.
With the air circulation and the desiccant it stays relatively comfortable temp/humidity wise, or at least no worse than it is outside.
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