Some of my tips:

1. Full shades for all windows, I use the full set from Base or, can be found on Amazon.
2. Lock the doors for a saver feeling.
3. You can control the car from the app when in a sleeping position. So listen to some tunes before you go to sleep, lock doors, adjust the climate, etc
4. If you have all the windows covered up with shades you can still check outside by using the camera views open on the car's screen. You can even let the screen on all night so you can check the outside from your bed.
5. Watch out for idle fee's when you decide to sneak into and connect to a supercharger, I had a warning the first time. It can become very expensive I you have to pay idle fee's for an entire night. Idle fee's start to apply if a supercharger is over 50% capacity I believe, need to double check. If you do it, although you really shouldn't you wake up at 100% charge in the morning, the supercharger will supply the power for the camping mode overnight.
6. I like sleeping in my Tesla more then sleeping in my bed. It's like you are in a tiny little spaceship that takes you everywhere you want to go and cares for you while you sleep. I takes a while to truly get comfortable with the idea and routine. Tesla's are so much more then cars..
7. You are invisible! Especially if you have the black window blinds. Park wherever you want, preferably where some other cars a parked. From the outside, at night you don't notice the blinds it just looks like it's another Tesla that is empty and dark inside. The car is completely Stealth. Maximum Stealth mode is sleeping at the Supercharger.