Is it safe to sleep in the car with the air conditioning on?

[VonLeonardo]

Sleeping with the air conditioning on while idling is unsafe for the body because the air inside the car cannot circulate. If carbon monoxide emitted by the engine leaks into the car, it will gradually accumulate, increasing its concentration and leading to poisoning. Many cases have occurred where people fell asleep and never woke up again. Additional information: 1. Button to activate the car's internal air circulation: The first button is for activating the car's internal air circulation. Literally, internal circulation means the air inside the car circulates. When the internal circulation button is pressed, the vehicle closes the external ventilation ducts, and all air circulation inside the car becomes internal, preventing outside air from entering. The first function is to prevent polluted external air from entering the car, keeping the air inside fresher. Another function is to maintain warmth inside the car. 2. Button to activate the car's external air circulation mode: The second button is for activating the car's external air circulation mode. When the external circulation mode is turned on, air flows between the inside and outside of the car, creating a ventilation effect that expels exhaust gases like carbon dioxide from the car and brings in fresh air from outside.