@Stavrogin Well… After two weeks and trying to test things as methodically as possible, my conclusions are the same: when I fall asleep with the watch face upside down, the sleep reading is accurate with respect to the time I fall asleep. Regarding the time I wake up, it’s more variable, although generally quite accurate, in my case.
Last night, with the watch updated to version 2.40.38, I tried wearing it on my usual arm, the one that doesn’t leave the watch face down when I fall asleep. Last night, I was especially tired. So much so that I was falling asleep on the couch. I went to bed at 11 PM and I’m pretty sure I fell asleep in 5 minutes. And I got up at 7:30 AM with the alarm.
However, in the morning, the log said I fell asleep at 2:46 AM and woke up at 6:48 AM. Sigh…
I totally agree with you. It’s frustrating to think that something that wasn’t working before is finally going to work, and it’s still the same… Personally, I’m more disappointed with the swimming measurement, but the feeling is the same.
Anyway, it’s only been one night with the new FW, so I’ll keep trying things out. Personally, I don’t care much about what the watch says; I’m not a good sleeper, and this “research” is serving me as motivation to be more aware of what time I go to bed and whether I’m already later than I should be.