For anyone who is suffering from this, or on some days finds it hard to sleep I recommend Science and Futurism With Isaac Arthur podcast.
It has "Narration Only" versions of all episodes and it is very interesting, so if you can't sleep you can listen to it but it will not have harsh noises.
Also Philosophize This has the same properties (very old episodes have some loud music).
+1 to Isaac Arthur videos as lullabies. The only thing I regret is that then I also need to rewind each episode multiple times because I'm genuinely interested in what's said.
Recently I've also started to listen to luetin09's Warhammer 40k lore videos. They are in similar vein that they could also be podcasts. Skeptoid is another one I've used.
It has "Narration Only" versions of all episodes and it is very interesting, so if you can't sleep you can listen to it but it will not have harsh noises.
Also Philosophize This has the same properties (very old episodes have some loud music).
Let me know if you know similar podcasts.