I built this service to help deal with this problem: https://omreader.co
It allows you to read blogs (RSS feeds) and email newsletters on your Kindle. I originally started working on this to help me read financial news without needing my phone which I find to be a really distracting environment. I would find myself mindlessly opening up and scrolling through reddit or HN and in my experience, repeatedly doing that has a tendency to destroy ones ability to concentrate. It's super nice to be able to wake up without your phone near you and still be able to read long form content.
I just launched it out of beta but any feedback would be great.
Edit: HN is currently hugging the database to death. The site is still working fine but I apologize for any slowness. I will upgrade the database tonight.