I really enjoy reading dense hard science fiction that I don't fully understand. I'm only really capable of reading when my ADHD med kicks in, so this is kind of an issue since there are many other things that require my medicated attention. But reading sci-fi when my brain is properly tuned is a source of great pleasure to me. A lot of what I read is about characters that are somewhat deranged and post human. I imagine that a lot of people find those characters unsettling, but I feel cozy around them since I'm not conventionally human myself.
I'm talking about authors such as Greg Egan, Greg Bear, Peter Watts, and some things by Robert Heinlein, Asimov, and Philip K. Dick.