This is one of the strangest principles and, in a few cases, even laws that exist in many countries. And that's that, for a reason that to this day I simply cannot comprehend, sleeping in your car is at a minimum frowned upon by law enforcement, and perhaps even illegal in some countries. In the United States, if the cops get a call that someone is sleeping in a car, there are high chances that the cops will go there and start harassing the person, demanding his ID and making up all kinds of infractions and, at a very minimum, demand him to leave. Why? I seriously have no idea. And this is not exclusive to that country either. It seems that in most countries (at least the western ones), authorities behave in similar ways, at a very minimum considering it... I don't know... inappropriate? Suspicious? Dangerous maybe? Probably even the cops themselves don't know, they just have this strange notion that it's not ok to sleep in your car, period, and will make up reasons why...