We've driven overnight from SE Pennsylvania but don't make as good time as everyone else. Wow- 16 hours from NE PA? I'm impressed. How did you do it?
However dh always sleeps for at least six hours before the drive, which is his normal night's sleep. I hate to do this- because I don't sleep well because I'm too busy worrying if he's awake.
Also- you can't count on the kids sleeping. Our dd 12 can't sleep in the car. She just drifts in and out over the course of the trip. This year, we're doing the autotrain because we're making a few stops in FL. Next time, if the fares on SW remain as low as I'm seeing, we might fly.
Have a good trip.