There's no need to be outrageous, because the answer is simple:
Humans are diurnal creatures. Evolutionarily speaking, we're not used to being awake at night, so our eyes are terrible at seeing in darkness, which makes sense considering, y'know, humans are diurnal creatures. Because the night is not our natural wakey-wakey time, things that lurk in it or happen during it are seen as mysterious or even evil. It's the time of day when many people do things they're ashamed of. It's the time of day when people disappear or are found having been devoured by predators. It's the time of day when anything could leap out at you at any time, and when you feel the most vulnerable due to the fact that your eyes aren't equipped to handle darkness.
And that's a large reason why nighttime is instinctively intimidating.