How to ventilate RV air conditioner when sleeping in the car in winter

We don’t need to worry about ventilation when we are resting in the RV, because no matter what kind of vehicle it is, it is airtight, and the air-conditioning vents of the vehicle and the ventilation holes of the body will have air circulation, just like when you are at home, close the door and close the window. Are you sleep deprived of oxygen? The airtightness of the RV is actually similar to that of the home, so there is no need to worry about ventilation.