How long can you sleep in a car with the windows closed before experiencing oxygen deprivation?

[LeAaliyah]

Sleeping in a car with the windows closed will not cause oxygen deprivation, as the vehicle is not an airtight space. Significant damage to the car's engine: Sleeping for extended periods with the air conditioning on while the car is stationary can have a major impact on the engine. Since the engine is running to provide power but the car is not moving, this increases the rate of carbon buildup in the engine and also raises fuel consumption. Can lead to increased fatigue: Sleeping in the car, due to the lack of proper seats and back support, often results in back and muscle pain during rest. Maintaining one position for a long time, especially when leaning against the seat, tends to concentrate pressure on the lower back. This sleeping posture further strains the back, leading to a feeling of increased fatigue rather than restfulness.