Interesting that blue light is enough! Sun drying clothes is the most effective way to get rid of annoying stains, as any Mediterranean parents would know (UV cleans even better than blue light!).
In Switzerland, we are expecting a fiercy battle in the next years for the access to water resources: from one side, the ski resorts that will need more and more snow to sustain their business, and from the other, the population and its need for water for industry and agriculture. I know that it sounds ridiculous, but I'm not sure the latter will win....skiing is a religious in Switzerland.
I have developed the same habit and any podcast, audiobook, boyfriend reading book works for me. I fall asleep much faster if I listen to something that is not in my mother tongue. It works even when I need to do an afternoon siesta. If the episode is interesting, I re-listen it when I am completely awake.