User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E8 - Blake Sucks - Impressions/Recap/@comment-34633327-20171207052944/@comment-27144409-20171207190832

Regarding the nocturnal section, I have some possibilities.

1: Since some characters have personalities, likes, dislikes, taste preferences, etc, that correspond with the animal they got their traits from, and modern society has a fair number of night owls and businesses with graveyard shifts. It might make sense if some of the Faunus with traits from nocturnal animals were more likely to prefer the twilight hours.

Plus, given that many Faunus have natural night-vision in addition to their single physical trait, it's entirely possible that Mangerie might have more of a night life than predominantly human communities.

2: Maybe they were unlucky and got a bad trait that hinders their ability to live a normal life. Perhaps something like extra-sensitive skin.

2.5: They have a trait that makes the night more appealing as opposed to making the day specifically undesirable. Bioluminescene seems like a good example.

I know I'm being vague, but you're not the only one who found the mention of a nocturnal section to be rather intruiging/puzzling. I'm having a hard time coming up with more specifics for the latter two.