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Is it okay to sleep in the car without opening the windows?

1 Answers

JaylaAnn

07/30/25 6:53am

It is not advisable to sleep in the car without opening the windows, as sleeping in the car, especially for extended periods, poses a risk of oxygen deprivation and suffocation. Whether suffocation occurs depends on whether there is enough oxygen inside the car. Generally speaking, if the doors and windows are tightly closed, one person sleeping in the car overnight will have enough oxygen. However, if there are multiple people and no proper ventilation, it can lead to oxygen deprivation. Generally, sleeping in the car after turning off the engine is not a problem, provided it is in an open and ventilated area. It is best to open the windows slightly to ensure sufficient air circulation. In reality, cars are not completely airtight, and in an open area, even without opening the windows, it is usually fine, though opening the windows for ventilation is still recommended. If the engine is idling and the air conditioning is on while sleeping in the car without opening the windows for ventilation, it can be very dangerous. If the engine remains idling for a long time, it can lead to incomplete fuel combustion, producing carbon monoxide gas. Inhaling excessive amounts of carbon monoxide can result in poisoning.

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