In the very worst case, falling asleep with the engine running can cause carbon monoxide levels to skyrocket inside your cabin, resulting in death. Besides harmful gases, you can be at risk of another person's recklessness, theft, or assault.
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7 Places You Can Park Overnight & Sleep On A Road Trip
There is no law against this. You will need to keep up the registration on your car, and the annual inspection, because you will need to periodically move your car. While it is not illegal to live in your car, where you park the car and for how long is where you can start to get into a legal gray area.
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.