Will sleeping in a car with windows closed cause suffocation?

1 Answers
RebeccaDella
07/29/25 12:58pm
No, but it is not recommended. Here are the specific details: Introduction: When the car is turned off and the engine is not running, sleeping inside will not cause suffocation. Even with the windows closed, the car body structure has some gaps, so the interior is not completely airtight. The oxygen concentration inside will not be too low to cause suffocation, though you may feel groggy upon waking up. Precautions: If the engine is left idling and you sleep in the car without opening the windows, this is inadvisable and poses a life-threatening risk. When the engine idles, incomplete fuel combustion produces carbon monoxide, which can accumulate inside the car. At certain concentrations, it can lead to poisoning. It is best to open the windows slightly to allow air circulation when sleeping in a car.
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