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    How is sleep quality calculated?

    Scheduled Pinned Locked Moved Suunto Vertical 2
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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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