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I don't have experience with Fitbit, but I have been using Garmin Fenix 7x for the past two years and I can confirm that at least in my case, its measurement of

I don't have experience with Fitbit, but I have been using Garmin Fenix 7x for the past two years and I can confirm that at least in my case, its measurement of my sleep quality is only loosely connected to reality. As I am an avid runner and I train daily, I pay close attention to all sleep, heart rate, stress, and running performance numbers. Unfortunately, it will frequently say I had good night of sleep when I definitely feel groggy or the opposite. As to misclassifying idle time before and after sleep, I recognise that simple lifestyle adjustment could fix it (just don't browse on your phone before sleep!) But that of course won't fix it if you try to lie still but can't fall asleep.

lloeki 3y ago
My anecdata is different: sleep is mostly accurate, if sometimes a bit fuzzy, and occasionally misses the mark. Regarding grogginess or lack thereof, what I noticed is that sometimes I feel that way even though the watch says I had good rest, but it's only so at the beginning of the day; afterwards I'm okay. Conversely I may have had a bad night and still feel okay, but what I noticed is that if I don't pay attention to the watch I'm actually plowing through and don't notice I'm wearing myself out, which I then have to repay the following days. Also the watch gives a) objective measurements (whereas my feeling is subjective) and b) measures only a bunch of things but not everything (e.g I noticed eating pasta or something weighting on my mind and morale can both make me experience brain fog that the watch does not account for)
petre 3y ago
Drinking one or two cups of green tea helps with my grogginess. Or some light cardio exercise like 3 minutes of rope jumping if you're more inclined to do that rather than stimulents. I also drink a shot of espresso sometimes, but the tea does a much better job without risking a headache. It's Chinese green tea with low caffeine content, Chun Mee or other blends from Yunnan or Anhui. I like their method of processing more than what is used in Taiwan or Japan.

lloeki 3y ago

My anecdata is different: sleep is mostly accurate, if sometimes a bit fuzzy, and occasionally misses the mark. Regarding grogginess or lack thereof, what I noticed is that sometimes I feel that way even though the watch says I had good rest, but it's only so at the beginning of the day; afterwards I'm okay. Conversely I may have had a bad night and still feel okay, but what I noticed is that if I don't pay attention to the watch I'm actually plowing through and don't notice I'm wearing myself out, which I then have to repay the following days. Also the watch gives a) objective measurements (whereas my feeling is subjective) and b) measures only a bunch of things but not everything (e.g I noticed eating pasta or something weighting on my mind and morale can both make me experience brain fog that the watch does not account for)

petre 3y ago

Drinking one or two cups of green tea helps with my grogginess. Or some light cardio exercise like 3 minutes of rope jumping if you're more inclined to do that rather than stimulents. I also drink a shot of espresso sometimes, but the tea does a much better job without risking a headache. It's Chinese green tea with low caffeine content, Chun Mee or other blends from Yunnan or Anhui. I like their method of processing more than what is used in Taiwan or Japan.