Carbon monoxide is a clear, odorless gas produced by internal combustion engines. Under certain circumstances, it can accumulate imperceptibly within the vehicle, leading to suffocation and death.
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And while getting some shut-eye inside your car isn't necessarily illegal, it's where you are parked while you sleep that can get you in trouble. For instance, many parking lots, private garages, and even public areas ban overnight parking — with or without sleeping people onboard.
Is it dangerous to sleep in your car with the windows closed? No, not dangerous at all. Only the lack of fresh oxygen when you sleep could give you a headache. But it is not different from sleeping at home with the windows closed.
Answer. The easy answer to this question is that you will never run out of air. You will just exchange the breath that you breathe in with the breath that you breathe out.