I was thinking of this watching Walking Dead the other day...and it really irritated me.
In that situation, people wouldn't do jack squat after sundown.
Yet, they show Carol or others surrounded by numerous (not just one) candles or lanterns. Then, I saw Carol use a MATCH to light a cigarette, right after adjusting a lit lantern! Use the lantern you dolt! Do matches just regenerate post SHTF? Why waste a resource when a flame is RIGHT THERE!!!