Thanks for this great package! And for the theme suggestions, I love them!

I'm using a very similar setup as the one from the README:

  (setq calendar-latitude 26.084534)
  (setq calendar-longitude -80.238454)
  (setq circadian-themes '((:sunrise . apropospriate-light)
                           (:sunset  . nord)))
  (circadian-setup)

The switch as sunrise/sunset does occur, but leaves me with a theme not fully loaded. Here is a screenshot of a session using Polymode on a RMarkdown file (so essentially mixing Markdown and ESS mode), after a sunset switch to Nord theme:

Simply closing and restarting Emacs shows what I should have:

What's missing is the correct background in the ESS chunk. Not too sure where to starts from here…