I recently read a piece in Scientific American about drugs working better at different times of day because of circadian rhythms. I found it interesting. The article is behind a paywall. Some of the “more to explore” stuff from the article is not quite as tied up.
http://science.sciencemag.org/content/359/6381/eaao0318
http://www.pnas.org/content/111/45/16219
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3885389/