I have a forerunner 745 and wear it most of the time, I’ve noticed a couple of things:
- sleep score has helped focus on getting more sleep but the ‘stages of sleep’ it reports are probable rubbish.
- body battery reaching 100 in the morning seems to correlate with naturally waking up.
- stress score is always elevated after exercising and tends to decline back down over a few hours.
- After hard sessions the stress score stays elevated for much longer than an easy one.
- if the stress score is higher than usual through the day it prompts me to think why, eg if I’m ill.
That said, take the metrics with a big pinch of salt…