This command can be used to set the game into 'overnight session' mode. This causes the game to skip the specified amount of ticks after each tick (so you can leave your computer on over night and the game will run slower).
overnight [ticks to skip]
|Ticks to Skip||The amount of ticks you wish to 'skip' - e.g. with 2, the game would skip 2 ticks for every tick. Use '0' to turn off overnight mode.|