Refers to something that is dark, painful, melancholy or grave in nature.
Word usage stems from various television dramas in which a character is seen alone gazing gloomily out of a night bus window, eg. Joan on Mad Men taking the nightbus home after visiting an abortion clinic.
nightness is another word for good night, nighty night ect it was created wen i had a thing about putting ness on the end of everything i sed and it jst suck.
person 1: im off to bed person 2: aww :(
person 1: nightage!!
person 2: nightness!! wuvs oo!!
person 1: wuvs oo more!!