score:3
Of course there are. It is even very common, at least for long distance run
For some lines (such as Medan-Singkil), it is even the only option available. The thinking is that there is less trafic at night and that, especially on a twisty mountain road, you see better the incoming car at night.
I took night transports (long distance taxi, minibus or big bus) on line going from Medan to Singkil, Dumai and Pekanbaru. Each of those is at least 10 hours long.