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    How is sleep quality calculated?

    Scheduled Pinned Locked Moved Suunto Vertical 2
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    • G Offline
      gkaempfer Bronze Member
      last edited by

      I’m sick, I woke up countless times, had a headache, took painkillers, in the morning I felt like a wreck.
      This is what my V2 figured. Maybe long “sleep” is the key factor??
      1000167908.png

      HonzaSH M 2 Replies Last reply Reply Quote 1
      • HonzaSH Offline
        HonzaS @gkaempfer
        last edited by

        @gkaempfer Sleep tracking is crap. It doesn’t reflect HR and HRV. Also it doesn’t count with changing to winter time. It shows 1h shorter sleep.

        Suunto Vertical 2 titanium

        G 1 Reply Last reply Reply Quote 5
        • 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…

          1 Reply Last reply Reply Quote 1
          • 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.

            1 Reply Last reply Reply Quote 0
            • Richard ThygesenR Offline
              Richard Thygesen
              last edited by

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

              S9
              S9 Peak
              Race

              1 Reply Last reply Reply Quote 0
              • 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.

                1 Reply Last reply Reply Quote 1
                • 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)

                    M 1 Reply Last reply Reply Quote 0
                    • 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.

                      1 Reply Last reply Reply Quote 0
                      • 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.

                          1 Reply Last reply Reply Quote 0
                          • 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.

                            1 Reply Last reply Reply Quote 0
                            • 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

                              1 Reply Last reply Reply Quote 0

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