Leviathan Wakes by James S. A. Corey
This one being missing is what stood out to me. I'm admittedly a bit of a fanboy of the series (and the TV adaptation) but it certainly feels like it deserves a spot to me. Like you said, it's good, accessible and fun, but I also think it handles geopolitics (well, solar system politics) in a fantastic and believable way.
I think the series understands human nature on a fundamental level. A lot of sci-fi is great at exploring high-concept ideas but it often tends to falter when it comes down to the personal, more human, individual level, I find. The Expanse series feels like its high-concept, sociological ideas are an extension of the individuals, which really helps to sell the world, I think. It also means the "villains" and the "evil factions" tend to have understandable, if not sometimes even relatable, motives.
It also just handles the science really well; the physics, especially, but also some biology, is integrated into the plot and world-building really nicely, but it never feels like you're reading a dense scientific journal filled with techno-babble. It gets across the concepts really well without getting bogged down with unnecessary details.
Typically around 04:00-12:00 for me. Fortunately, I have a job that fits nicely around that, so I'm in a pretty good place overall, but when I do have to try to shift to more "normal" schedules it really wreaks havoc on my energy levels and mental clarity.
I've tried all sorts in an attempt to make a "normal" schedule work for me, like sleep monitoring, therapy, sleeping pills, and just being really over-the-top about my sleep hygiene (like not allowing screen usage for X hours before bed, no drinking or eating X hours before bed, etc). I can sort of make a "normal" schedule stick but I never feel good for it. And it takes constant work because my body naturally wants to gradually drift back towards a 4am sleep time, and I find going to sleep earlier than previous nights very difficult so once it starts slipping it usually takes an all-nighter to get it back to where I want it.
Like I said, I've generally got things pretty good right now with my job and lifestyle working around my sleep schedule. But it'd certainly be a lot easier if society didn't think I was lazy and was able to accommodate me (and other people with less "normal" sleep schedules) a little more.