there was a short period of time when I was able to sleep outside and i took advantage of this. I felt really good!in the morning I felt refreshed and grounded and ready for the day
Now however I live in an apartment in the city, sleeping outside simply isn't an option. I am curious about how you were able to sleep outside and where you did sleep?
As for sleeping in your car I think the reason it is not good is because you are not grounded. The air in the tires of your car, and the fact that your car sits on concrete, does not allow you to connect to the earth.
I think it is this physical connection to the earth that renews and rebuilds your body during the night. Something to do with negative ions... not really sure...