Is it okay to sleep in the car without opening windows or turning on the AC?

1 Answers
IrisRose
07/29/25 12:07pm
Cars are not completely airtight, so it's possible to sleep without opening windows, but it's crucial to turn off the engine. For better comfort, it's advisable to open windows for ventilation when sleeping in the car. Without ventilation, the interior can become stuffy and hot. To avoid heat and oxygen deprivation, opening windows is the safest option, but always ensure the engine is off to prevent potential poisoning. Below are some relevant details about sleeping in a car: Methods for sleeping in a car: It's best to open windows when sleeping in a car. Many road-trippers inevitably sleep in their vehicles, and most leave a window or the tailgate slightly open for airflow. To accommodate rainy weather, some install window rain guards, allowing a small gap for ventilation even during rain. Effects of sleeping with windows closed: Sleeping with windows closed can make the interior uncomfortably hot depending on the weather. Always turn off the engine when sleeping in a car. When a car is stationary, insufficient air intake leads to incomplete combustion in the engine, releasing harmful gases. Inhaling these gases can cause mild symptoms like dizziness and vomiting or, in severe cases, even death. Therefore, always shut off the engine when sleeping in a car.
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