According to wikipedia also:
The Japanese themselves called the night resupply missions "Rat Transportation" (鼠輸送, nezumi yusō), because they took place at night.
Most of the warships used for Tokyo Express missions came from the Eighth Fleet, based at Rabaul and Bougainville, although ships from Combined Fleet units based at Truk were often temporarily attached for use in Express missions. The warship formations assigned to Express missions were often formally designated as the "Reinforcement Unit", but the size and composition of this unit varied from mission to mission.
But, in the game, this is impossible to perform night moves from Rabaul. The best that can be done is near Munda.