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yeah, the sleep thing gets confused if I wake up but don't move. in general though, stats like the HRV do correspond to if I'm feeling refreshed or not. Takes weeks to get enough data for some sort of baseline though, the first few weeks don't give much that's useful.
I also found I had to wear it all the time. If I just wear it when I run then things like race predictions are all over the place, presumably as it doesn't really know resting HR.
When I wear it during the day and to sleep then it does seem better.
initial thoughts on my new Forerunner - https://mattw90.substack.com/p/experience-with-my-new-forerunner