Useful resources
From Polyphasic Sleep Wiki
Crimsonflwr is the leader of the Polyphasic Sleep Discord as well as subreddit. He and others have published a plethora of articles concerning polyphasic sleep on the blog, which are considerably more up-to-date than most other resources on the internet.
Napchart is a useful tool to create and display polyphasic sleep schedules.
Polyphasic Sleep Discord is an active online community for polyphasic sleeping. Here you can discover everything from scheduling tips to polyphasic experiences by long-time polysleepers.