Currently, if you have the Nocturnal Negative Trait - It swaps the Day/Night Cycle, but Removes any benefit from Light Sources (At least that's how it feels like it's coded?) - It works, but the severity of the darkness at Full Daylight honestly is a physical pain to try and stare at to differentiate tiles.
I know for example, the Blind Negative Trait actually just removes the Day/Night visual cycle all-together, but limits Vision to just a single square radius/3x3 tile area around you centered on you. It's.. -significantly- easier to see things next to you as a Blind character, than it is Nocturnal during the day.
I'd personally just appreciate the maximum darkness tones down a few degrees, so you could still visually have some contrast between tiles/make it less harsh on the eyes to try and focus. Sometimes I just need to put my character to sleep and watch YouTube until Night happens because it's causing a Migraine to stare at.
Like the 3x3 Tiles is perfectly fine, I just would like to be able to still play during these periods without hurting my eyes, Hah.
(It'd also be Aesthetic if it would be brightening the screen while limiting the Vision, instead of Darkening, but I understand that's more and potentially unneeded coding. Just a cute thought.)
-- TL;DR
Nocturnal makes the screen Too Dark during Daytime, and it can cause eye issues for folks with such.
Requesting maximum darkness lightened up a bit for ease of player experience, while still not removing the difficulty of the Trait.
Optional: Swap Darkening to Lightening for Aesthetics