I did free-running sleep for a while (I mention this in the original 28h day post), but decided on 28h days to weekly match other people's schedules.
I exercised regularly before 28h days, and my sleep was still chaotic with that. I didn't exercise daily though, it was hard to fit everything I wanted to do on a 24h day. Having longer days means I can fit more things, which I think is one of the reasons why I increased the amount of exercise after moving to 28h.
I also haven't read any research on this, I just did what felt more natural and logical to me.
For the few weeks that I'm required to go back to a "normal" sleep schedule, I long every day to go back to my 28h schedule.
I might at some point in the future try moving back to 24h for a longer period of time, but I'm planning to stick to the 28h schedule for at least a couple more years before I do this, and I'll keep doing the yearly updates to document things.
I don't have one yet, but I will definitely make one once I make a public release of nixless-agent. At the moment I use a combination of nixos-anywhere (for initial provisioning), colmena (mostly for quick testing/dev setups, because it lets me push things directly to a machine), and nixless-agent (still experimental and going through lots of testing). Ideally my final setup will be just a mix of nixos-anywhere and nixless-agent.
Thanks! I have to admit that I've had the itch to build my own NixOS-inspired system more than once, and I haven't done that because I just don't have time to dedicate to this among all the other projects I'm working on. I wasn't aware of not-os before, but I'll definitely dig into the code!
As others said, I've moved away from doing nix builds on servers and into a less wasteful (if you're running multiple servers) approach of building once, deploying the bits into a cache, and making the servers fetch them from a cache. I've been slowly working on my own tool to make this workflow easier (nixless-agent, you can find an early version on GitHub).
I exercised regularly before 28h days, and my sleep was still chaotic with that. I didn't exercise daily though, it was hard to fit everything I wanted to do on a 24h day. Having longer days means I can fit more things, which I think is one of the reasons why I increased the amount of exercise after moving to 28h.
I also haven't read any research on this, I just did what felt more natural and logical to me.