so nothing to preclude you launching off into complete darkness with all the issues that come with that (illusions, possibility of CFIT, possibility of inadvertent IMC, etc etc).
all this should be covered during the NVFR rating, well at a good school anyway. circuits at black hole airports. cloud covered nights cloud at levels well above LSALT, and moonless nights. its the stuff that will kill you if you dont have previous experience with an instructor onboard.