Neurodivergence can manifest partly in the form of sensory sensitivity, which can include light sensitivity.

I'm not sure, my partner is autistic. She doesn't like bright lights, but she hates changes in brightness even more, so the lights being on helps to deal with the flickering from screens.

It's not dark rooms necessarily, but low stimulation environments. Many ND conditions limit mental "bandwidth". Sensory processing can eat up a lot of that bandwidth normally. Throw in something like socialising, that eats even more, and we can saturate.

The manifestation of that saturation can vary a lot. My personal preference is a quiet, well lit place, with a static environment. It's change and ambiguity that cause me problems. I fully understand the appeal of darkness, however, particularly if your sensory filtering on intensity is prone to failing.

I just like the mysterious hacker or vampire vibe.