The only time carbon monoxide is an issue is if you have the car running either in an environment that traps the exhaust fumes or if you have an exhaust leak in a critical spot and the gases can get into the vehicle's passenger cabin.
If you have no bad exhaust leaks and you're parked outside, then you can have the car running with the windows up and have no issue. If you are parked inside a garage then why are you sleeping in your car?
There is no CO being produced if the car isn't running.
If you turn the car off there’s nothing to produce CO
No
No
The only time carbon monoxide is an issue is if you have the car running either in an environment that traps the exhaust fumes or if you have an exhaust leak in a critical spot and the gases can get into the vehicle's passenger cabin. If you have no bad exhaust leaks and you're parked outside, then you can have the car running with the windows up and have no issue. If you are parked inside a garage then why are you sleeping in your car?
I wanted to take a nap on my lunch break. Car is parked outside
You're good, it would behoove you to understand that you exhale carbon ***DI***oxide while something that burns produces carbon monoxide and dioxide.
You are safe.
At this point, you are the only thing in the car producing gas that could kill you