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It’s typical for bedrooms to have a ACH (Air Changes per Hour) rate of between 0.35 and 1

So the CO2 is removed regularly.

Doesn't this assume forced air with the fan running for some percentage of the time? It's possible their fan doesn't run enough. It seems many people have that issue at least during some seasons.

This.

I studied for like 12 years in the biomedical field and I don’t really understand why OP is worried about this.

He could have an unusually tight bedroom. Also, ACH on windless nights will be manyfold lower than on nights with even a 2-MPH breeze.

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