I think maybe you were thinking of a different site link, because this is the first time we've been on HackerNews to my knowledge, and our shortest sessions are 15 minutes, and they never loop. If I'm wrong then really sorry about a bad experience, must have been a bug. Give it another shot if you have a moment :)

Lots of science to this. Here's a good start: https://www.brain.fm/pdfs/ResearchLibrary.pdf

We're still organizing it. Apologies for any inconsistencies. There's still stuff we need to add as well.