https://www.youtube.com/watch?v=Zk11vI-7czE
https://taibbi.substack.com/p/planet-of-the-censoring-humans
https://vimeo.com/423114384
Nova has documentary "The Mysteries of Sleep" which explores many aspects of sleep.
One being "pink noise" which can help people experiencing sleep difficulty enter deeper sleep.
https://www.pbs.org/wgbh/nova/video/sleep-quality-quantity-boost-pink-noise/
https://www.wgbh.org/news/science-and-technology/2020/02/26/nova-explores-the-mysteries-of-sleep
https://www.berkeleywellness.com/healthy-mind/sleep/article/pink-noise-sleep