What Happens If You Sleep in a Car with the Engine Off and Windows Closed?
2 Answers
It can lead to oxygen deprivation. When a car is stationary, the air inside and outside the vehicle struggles to circulate. The carbon monoxide emitted by the prolonged operation of the engine may gradually accumulate inside the car. Additionally, the occupants' breathing consumes oxygen and releases carbon dioxide. Over time, the oxygen level inside the car decreases, and occupants may unknowingly suffer from poisoning and lose consciousness, which can be fatal in severe cases. Here are some precautions for sleeping in a car: 1. Switch to the external air circulation mode: Many car owners have the habit of using the internal circulation mode to maintain the temperature and air quality inside the car, which is not wrong. However, to ensure proper air circulation while resting, it is recommended to switch to the external circulation mode. 2. Neither the air conditioning nor the heater can replace an air purifier: While some vehicles are equipped with air purification functions, they are rare. The car's air conditioning and heater are not air purifiers. Therefore, do not assume that keeping the air conditioning or heater on while sleeping will prevent poisoning. Even if an air purifier has been installed, it is still advisable to ensure proper ventilation. 3. Open the windows for ventilation: If you want to maintain air circulation, opening the windows is the most straightforward method. Leaving a small gap can also facilitate air movement.
I have previously conducted in-depth research on vehicle safety-related cases. Sleeping in a car with the engine off and windows closed is extremely dangerous because the interior space becomes completely sealed after the engine is turned off, and air circulation comes to a complete halt. Oxygen is quickly consumed by breathing, while carbon dioxide accumulates rapidly, leading to a state of hypoxia that can cause dizziness, fatigue, or even unconsciousness. If the environment is enclosed, such as in a garage, external carbon monoxide (CO) may also leak in, directly leading to poisoning and death. There are real-life stories of many people who took a short nap and never woke up, especially during hot weather when more people take the risk. I urge everyone to absolutely avoid this practice. The safe approach is to slightly open the windows or use the air conditioning ventilation system when resting in a parked car to ensure fresh and flowing air. Remember, this is not just a minor risk but a fatal mistake, with tragedies occurring every year.
