Starting a separate thread on this... for me, I get significant bouts of fatigue even when I don't have any active arthritis. Sometimes a couple of very strong coffees can help me feel more awake, but this comes with obvious side effects (being hyper, anxious, etc.) Sometimes coffee doesn't help and I have to lay down for a couple hours instead, sometimes a full day or two. Also taking NSAIDs, while I try to do it sparingly, help with fatigue.

Any other tips on how to alleviate AS fatigue?

Also how the heck do people rest during office work hours? Many articles online recommend you make arrangements with your employer to be able to lie down somewhere for several hours. That's a nice idea but I suspect that would be a difficult ask in practice for most workplaces.