[notatoad]

my experience with garmin (vivoactive, not fenix) was that they had all kinds of precision and detail, but it also didn't even notice when i got up to pee in the middle of the night - just a straight line through the graphs as though i hadn't woken up at all. that was the end of my trust in their sleep tracking.

[lloeki]

Mine reliably notices that I woke up and immediately go under when my wife comes home late in the night, which happens basically every day (because bartender) so I get somewhat statistically significant results in that regard.

It's accurate enough.

[gf000]

The Quantified Scientist does very detailed, measurement-based tests on all sort of smart watches, you might want to see where your device stands in his charts in terms of accuracy.

[danielscrubs]

Had a Garmin that would say my table had a heartbeat.

[notatoad]

that actually might have been accurate.

my garmin was really good at picking up my heart rate. there was one time i had it in a waist pack, and i was wearing a chest strap that was not paired to the garmin, and the garmin managed to pick up a pretty accurate heart rate for most of a bike ride.