For those interested in learning more about circadian rhythms, I highly recommend checking out the materials that UCSD's BioClock Studio has put out. As you might be noticing, there's a dearth of accessible circadian biology materials. The BioClock Studio has interested undergrads create movies and media addressing critical circadian biology concepts, experiments, and researchers.
https://ccb.ucsd.edu/the-bioclock-studio/about-bioclock-stud...