I need to sleep in my car overnight since I am driving cross country. I will be in Texas or Oklahoma most likely and it's supposed to be hot. Videos on youtube just show you turning the car on and setting the AC to whatever you want and then just going to sleep. Is it really that easy?

2015 with 103,509. Only uses a gallon of gas? I know the car will turn on a couple of times every hour and I read that putting the ebrake on helps with the shaking so you don't wake up. Am I missing anything here? I will be in a hotel parking lot so outside so I don't need to worry about exhaust. I just turn the car on and instead of driving, I just sleep and the car will be ready to drive in the morning? So awesome if true. I have driven cross country and never knew the car had this feature. I don't want to spend the money for a hotel.