Omg, I didn't read this right away cuz I was like "I know what he's going to say..."
But this: "What's interesting though, is that he adapted a 48 hour rhythm: He was awake for around 36 hours straight, and then slept for 12-14 hours at a time."
I totally do this.
I've done a lot of looking up about sleep and the like, but I've never seen this anecdote before.
You just wrinkled my brain.
That's so interesting that you've experienced it yourself!
Just google the name Michel Siffre to find out more, he did several of these experiments though. But that statistic was a result from his first one I believe.
Awesome. Thanks for the interesting lead. Another rabbit hole to explore.