Hi Dan, I wanted to share a few links to articles on pain and circadian rhythms that I wrote during my PhD. Would love to connect if you have any questions.

[0] Circadian rhythms and pain: https://www.sciencedirect.com/science/article/abs/pii/S01497...

[1] The disruptive relationship among circadian rhythms, pain, and opioids: https://www.frontiersin.org/journals/neuroscience/articles/1...

[2] Circadian rhythm disruption exacerbates pain behavior in male mice: https://www.sciencedirect.com/science/article/abs/pii/S03064...