the sexual tension between “if i don’t open my window i’ll sleep poorly because of CO2 levels” and “if i open the window i’ll sleep poorly because i’ll get eaten by bugs”
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is the CO2 thing real? seems dubious that it would change that much overnight
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subjectively it makes a big difference, i sleep noticeably better on days when i ventilate properly. and i’ve done experiments with CO2 monitors in the past, a poorly ventilated room can shoot up to 1000-2000 ppm in a day (outside is 400)

