From an individual's perspective, this is strictly worse than driving drunk. Not only can you not sleep in your car legally, you also can be charged with drunk

From an individual's perspective, this is strictly worse than driving drunk. Not only can you not sleep in your car legally, you also can be charged with drunk driving while sleeping in your car unless you go out of your way to dispossess the keys. You also certainly can't sleep in your car with the engine running, which is pretty important in the winter time. There are better alternatives than drunk driving, but sleeping in your car isnt one of them.