Did you actually read other people's posts? What kind of apps or websites that uses Tesla account have you used before? In my experience even after you change Tesla account password those apps with expired token (wrong password) could prevent the car to sleep. That's the first thing you have to check. Also, this includes official Tesla app. I mean, if you keep it open, then the car NEVER sleeps, waiting for your command.
>How will I know if my car actually went to sleep?
>Simply that when I go to get into the car that it takes the 10-20” to boot up?
TeslaFi is only one of a few apps that let's the car to sleep. Without TeslaFi, you wouldn't know whether the car is asleep or not, unless you wake it up.
As you mentioned, if the car takes a long time to boot, then the car WAS asleep but now awake.
>Or should I also expect to see a reduction in vampire drain overnight?
Yes. The rated range consumption (vampire drain) should be a few miles per day at most, possibly 2-3.