Better get a decent sleep somewhere, don't drive non-stop, even taking turns. Don't risk it.
I bought a car once in VA (I'm in NJ), and to save money took a bus there overnight, thinking I'd sleep on the bus, arrive early in the morning, pick the car and get back home by the end of the day. It worked, but I wouldn't recommend it unless absolutely anavoidable. There's no real sleep on a bus (in that respect, it's the same as napping in a car), and then you're falling asleep at the wheel... Risky.