Depends on the road and if there are signs say 'do not park'. If there are no signs and it is safe to park usually it is legal to 'take a nap'. The law would prefer a person napping instead of falling asleep behind the wheel of the vehicle.

As long as you obey all traffic laws (not blocking traffic, not disobeying a sign, etc) then you should be OK. I would stay off the shoulder though since a less-cautious driver that chooses to drive on may fall asleep at the wheel and hit you. Find a small off ramp and a gravel lot, lock the doors, and go to sleep. I would also call a family member and at least leave a message saying where you are, what the time is, how long you expect to stay, and what you are doing. This way, should something happen, there will be a record of your last known location. Not to freak you out but it never hurts to plan for the worst.

They could get you for loitering. They wont usually, but if you had anything to drink, throw your keys under the car, they can give you a DWI.

Yes, as long as there are no signs forbidding it. Most interstate systems will not allow this. The best and safest bet is to pull off the main drag and find a WalMart parking lot to sleep. Its much safer, all the way around.

from what i know of it's legal as long as you aren't in the way of traffic and there aren't any signs that say that you can't park there...

Yes, where is it legal to pull over and stop, It would also be legal to take a nap. Be sure to lock all your doors, and notify someone you are there.

"Sleeping in your car is one of those irregular activities that most Americans are not psychologically prepared for. If you are, the principle impediment is getting past those who aren't. It's better to avoid situations in which you need to try to explain "We're just sleeping in our car, Officer." Officer gets a two week vacation every year, and his family sleeps at the Motel 6 at Orlando. Drug dealers sleep in their car. So the challenge of finding a place to sleep in your car is not finding a safe place, but finding a place where you will not seem eccentric and therefore dangerous. Don't worry about your safety--just a little common sense, and you'll be as safe in your car as in your bedroom. Maybe safer---you can drive your car away from a prowler. Here are some ideas about where to park your car overnight and get a good night's sleep." - Public parking lots. - WAL-MARTS, etc. - Sportsmen's areas. - Roadside Rest Areas - Farm roads - Private Commercial properties [the particularities are discussed further in the reference] "Wherever you are, prepare an explanation that fits the circumstances, in case your presence is challenged. At a small-town airport, you could say you received an emergency message from home, and you might have to charter a light plane in the morning. At a road-side rest area, tell the police your car blew a fuse and you thought it best to not drive until morning. In any case, plan ahead and groom yourself so you do not look like a dispreputable character, and see to it that a search of your car will not yield any drugs, guns, alcohol, porn, etc. Never block access by any vehicles that might legitimately need to get by. Leave the key in the ignition and the drivers seat free, in case you have to leave in a hurry." Source and further information: http://www.webspawner.com/users/q389/ Further information: http://www.associatedcontent.com/article/805197/beat_gas_prices_save_money_sleep_in.html?cat=3 http://forum.ebaumsworld.com/showthread.php?t=176010

Yeah. Law enforcement actually wants you to do that to avoid accidents.

as long as you parked in a safe spot... in some places its fine as long as you are not drunk and even if you are in some places you can leave the keys outside the car and if shows you had no intent to drive(hide them well though)