Is it okay to sleep in the car without opening the windows?
2 Answers
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.
I've noticed many people are curious about whether it's okay to sleep in a car without opening the windows. I have to say, it's quite dangerous. With nearly 20 years of driving experience, I've heard and seen too many accident stories. If the engine is running, exhaust fumes containing carbon monoxide can seep into the car, and high concentrations can cause unconsciousness or even be fatal. Even if the engine is off, in a sealed space without air circulation, carbon dioxide can accumulate, leading to headaches and breathing difficulties over time. Once during a road trip, a friend of mine took the easy way out and slept in the car with the windows closed, only to almost faint the next morning due to the stuffy air. So, I strongly advise against not opening the windows. Either leave a small gap for ventilation—like lowering the window by 1-2 cm to ensure air exchange—or choose an open and safe parking spot. This significantly reduces risks and safeguards your health and safety. A car is like a small room; ventilation is key. Don’t overlook potential hazards for the sake of temporary convenience.
