The levels I have at night indeed are unhealthy, I’m still trying to find the best way to tackle this challenge..

Most wakeups are from noise (I can see it in the data) but high CO2 levels can also make me a lighter sleeper.

Not sure where you’re based but in Europe the priority is mostly on heat isolation, so air movement suffers. The US is better in that regard. There was a big thread on that topic on X the other week (Peter the indie hacker initiated it and there were some good recommendations in case you’re the owner of the flat)

Is your bedroom approaching 4 or 5k PPM? The chart screen shotted was at 3300+ and it looks like it kept going up after. Hopefully it's a bad sensor reading, but that is very high. I sleep in a small room with a few people and it's maybe 1500 and noticeable when that happens. Getting to 5k is potentially dangerous for extended periods of time.

https://en.wikipedia.org/wiki/Carbon_dioxide#Below_1%

https://archive.ph/dd5Kl

“Almost 2%. The reduction in carbon-dioxide concentration when 60 square centimetres of plants were placed in an office, according to one study.”