Nocturnal houses are my absolute favourite part of zoos, but I can't build the kind I've been to IRL with what we currently have in PZ, and will likely never be able to. This isn't because of the fact that it's currently impossible to make dark interiors, I'm fine just turning the game to night whenever I enter, but because nocturnal houses here essentially function as small native mammal houses and mostly contain obscure Australian species that are either very rare or entirely absent in captivity overseas. The only exotic species I’ve ever seen in a nocturnal house was Adelaide Zoo’s last Hoffmann’s two-toed sloth, and in the many years since she sadly passed on their nocturnal house has also been entirely native. Some good examples of modern nocturnal houses in Australian zoos would be Taronga Zoo's Nguwing Nura and Healesville Sanctuary's Animals of the Night (see videos below), as well as my favourite part of any zoo I've ever been to, the nocturnal house at the Alice Springs Desert Park, which I share some pictures from in
this old post.
Source: https://www.youtube.com/watch?v=HGJTq-DowJc
Source: https://www.youtube.com/watch?v=35tKQ5LJaRY
None of the Australian species we have in the game currently, aside from the death adder and cockroach I guess (but that's hardly a very thrilling display, especially with their less-than-stellar models), are species I'd put in a nocturnal house, even if several of them are nocturnal - the closest otherwise would be the spectacled flying-fox, but all the bats I've seen in nocturnal houses IRL have been ghost bats, with flying-foxes typically being kept in outdoor aviaries instead. Animals like bilbies, quolls, bandicoots, bettongs and possums just aren't species that are really on the cards as PZ additions, not to mention the really small mammals like dunnarts and hopping-mice that could only be added as exhibit animals. Then there's all the herps (pythons, geckos, frogs etc), birds (frogmouths, owls, stone-curlews...) and inverts that often feature in nocturnal houses here and also probably will never make it into the game. The only animal I've seen in nocturnal houses before that I could actually see being added to PZ is the short-beaked echidna, although they also do just as well in outdoor habitats.
From what I've heard the game is also lacking in species that are common in nocturnal houses on a global scale, so being unable to build realistic nocturnal houses is probably not just a me problem. But my needs are certainly a lot more niche
EDIT: Forgot the platypus!! They’re the only Australian habitat species we have that I’d include in a nocturnal house build, and thankfully they can also be housed in specialised platypus houses and so don’t depend on the addition of other nocturnal species to feel realistic.