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Plenty of people disregard monoxide monitoring, either through not having monitors, letting battery backup in monitors die (or the only power if they’re not hardwired), or not replacing them regularly (even if you change the batteries regularly they’re only rated for 7-10 years typically)

Another big one is just having insufficient monitoring for the space. When i purchased my home it only had one smoke/co sensor centrally located on the first floor despite the home having 2 stories and a basement, a wood burning stove, a fireplace, etc. the detector was at least 20 years old and the battery was dead (it still worked because it was hardwired but it didn’t give a low battery chirp). In this scenario even if a co leak occurred if it happened on the extreme ends of the home, on the second floor, etc (which is where the sleeping areas were) I could potentially be seriously impacted long before the detector was tripped, even if it was updated

Depending on where you live and your circumstances you may be able to get a co detector for free from the Red Cross or your fire department. Sometimes they’ll even install it for you. Depends on where you live though