I take it that it goes without saying that you don't ride alone at night?
I ride alone most of the time, day or night, makes little or no difference to how I ride although at night I do avoid the more tricky terrain and restrain my need for speed on the wide open stuff.
A spare light is a must, LED headtorch in pocket/backpack or spare LED commuter light on the bars. Space blanket in backpack, phone, usual spares. I tend to limit night rides to 2 hours but I have gone for epics in the past on full moon nights - turn your lights off and use the moon for the fireroads - mega cool!
Just be sensible and get on with it.
He's not the messiah, he's a very naughty boy.
95 Kona Explosif Singlespeed/Fixie - 100% Thrashed since new and it's still very well loved (and it looks it).
Dave Lloyd C.A.T.S W.I.S.K.A.S - Built, ridden, loved, and sold.