Update 2: We moved to a new bedroom and CO2 levels at night got very high again and we'd both regularly wake up at night, not optimal So I wanted to do the bathroom vent trick again, where putting the bathroom vent next to the bedroom on at night creates a low air pressure field and brings in new fresh air But the light switch was tied to the vent here so it'd blast bright light into the bedroom if vent was on, so I closed it but then it didn't help a lot. So we split the light from the vent…