@swansinflight@mastodon.nz my armchair theory is that things like ADHD and people who have a hard time getting up/going to bed at "normal" times is something which was evolutionary selected for and has a function in our "natural" habitats :)
for sleep cycles: it would make sense if roughly half of the population is awake at night because of e.g. predators.
i have no such explanation for ADHD though, only a feeling in my gut ;)