The Manalapan Diner used to be open 24/7 because we would go there occasionally after big, late night calls. I clearly remember about 7 of us eating there after midnight once everyone cleared from The Great 4th of July Rt 9 Cataclysm and Helicopter Rodeo(TM). Their last fire, somewhere around 2010ish, I think, shut them down for over a year and when they reopened it was part-time.
After that, the only place that we could score some grub in the middle of the night was the White Castle in Howell. I did it a few times, but it made for too much of an exciting ride if we happened to get toned out while we were 10 miles down Rt 9.
Very sad about Manalapan Diner. Used to go after nights out.
Wawa should have late night food though too.