Thanks, it will start as an open source project, as people may be concern about privacy with such as delicate subject. And I do master studies at psychology so it will be research topic at least for me :)
Even if it would be spurious, it would be interesting to see whether there is a correlation. (I used to have a Oura ring out of similar interests, but lost it somewhere someday.) Viz newsrooms see also:
For me the most interesting part is mood tracking, as many of the psychological methods are based on self-evaluation and here we have an opportunity to gather data real-time without user input.
Glad you came with oura ring as I though about this project as an oura ring for emotional state.
https://news.ycombinator.com/item?id=38779439