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    How is sleep quality calculated?

    Scheduled Pinned Locked Moved Suunto Vertical 2
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    • G Offline
      greenfish29 @HonzaS
      last edited by

      @HonzaS I noticed that yesterday. It’s a shame that Suunto offers too much “broken” functionality. It’s not so hard to fix issues like this these days…

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      • MarTej_czM Offline
        MarTej_cz
        last edited by

        @gkaempfer @honzas Daily sleep data 24-25.10.
        It will show your heart rate. HRV Unfortunately no, HRV will be average in my opinion. spO2 off. 1000006303.jpg

        Race 2 Titanium
        Forerunner 255,965
        Android 14.

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        • Richard ThygesenR Offline
          Richard Thygesen
          last edited by

          For me overall feeling, HRV and HR is all data I need.

          S9
          S9 Peak
          Race

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          • M Online
            matram Bronze Member @gkaempfer
            last edited by

            @gkaempfer
            Garmin (FR965) combined percentage of time in different sleep states, total sleep time, stress levels and how often you woke up. They actually presented a breakdown which was a nice feature.

            I assume Suunto is doing something similar based on how I see my sleep being scored. For me it seems Suunto has a problem judging light sleep vs awake state.

            Your score is obviously wrong. For me I think the scoring roughly works, although I think some improvement of the algorithm would be nice.

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            • MarTej_czM Offline
              MarTej_cz
              last edited by

              How many of us know how we really sleep? I have no idea. All I know is that I wake up on the toilet and that’s it. If we don’t have data from the laboratory, we don’t know anything. What matters is the feeling of sleep…

              Race 2 Titanium
              Forerunner 255,965
              Android 14.

              S 1 Reply Last reply Reply Quote 2
              • W Offline
                Wilson75
                last edited by Wilson75

                I’m quite concerned about this topic regarding the new algo used accross devices.

                I’m looking for a screenless device for sleep and daytime tracking, without having to wear a watch.

                My Suunto Vertical 1* isn’t reliable at all when it comes to sleep tracking. Does the Vertical use the same algorithm as the newer models (Vertical 2, Race3s)?

                If Suunto releases a screenless device but the sleep tracking isn’t reliable, I’ll probably skip it.

                @snow said in the Competitor watches Treads:

                https://the5krunner.com/2026/10/15/suunto-whoop-competitor/

                Suunto Vertical Titanium
                Suunto Wing
                SA (bêta) on Pixel 9pro

                S9B Titanium (sold)
                SSU (sold)

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                • M Online
                  matram Bronze Member @Wilson75
                  last edited by

                  @Wilson75 @MarTej_cz @Richard-Thygesen
                  I believe even the best algorithm would only reach 80% accuracy which is a big step down from what we are used to with HR and GPS.

                  I would tend to agree with previous posters that it is likely better to work off subjective feel or more integrated metrics like resting HR and HRV.

                  My experience with Garmin AI Coach was that it gave too much weight to sleep scores and flipped between - “rest day” or “go all out”.

                  Most companies would strive for one code base, i.e. implement a feature once and then include it in the device where you want to have it.

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                  • S Offline
                    snow* @MarTej_cz
                    last edited by

                    @MarTej_cz the number of times I yawn on my way to work gives me a pretty clear idea of how well I slept, much more accurate than any score you might find out there 😊

                    MarTej_czM 1 Reply Last reply Reply Quote 0
                    • MarTej_czM Offline
                      MarTej_cz @snow*
                      last edited by

                      @snow Feeling is the best measurement, as you say… In training, it’s just the opposite, when you don’t want to, the best performances are… 😂

                      Race 2 Titanium
                      Forerunner 255,965
                      Android 14.

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                      • B Offline
                        blur457
                        last edited by

                        I don’t care much about the estimated sleep quality, I just want the damn watch to accurately start the sleep tracking. Im sick of the morning report saying I got 10.5 hours of sleep when in reality it was more like 7.

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                        • 2 Offline
                          2b2bff Gold Members
                          last edited by

                          With my Race S sleep score is always between 72 and 88, regardless how well I slept. It is more of a random number generator.
                          With Garmin I had a lot more variety. Numbers between 30 and 99. Not that it always matches the quality of my sleep but more often than not it does…

                          Suunto Race S
                          Garmin Fenix 8

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