Suunto Race S Mistakenly Extended My Sleep Tracking After Waking Up
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I’m using a Suunto Race S (2.44.52) to track my sleep, and I noticed something strange last night.
I went to bed at 10:28 PM and woke up ~ 6:00 AM. The watch recorded my sleep quite accurately up to that point. After waking up, I exercised for a while, and around 6:35 AM, I took off the watch and left it on my desk. Then, at 7:29 AM, I plugged it in to charge.
However, after syncing the data, I saw that the watch continued to record my sleep until 7:29 AM, and marked 6:00–6:35 AM as “awake” time — as if I had gone back to bed!
Has anyone else experienced this issue? Could it be a firmware or sensor glitch when the watch is stationary off the wrist?
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@vietpq that is quite strange since one would assume that if there are no heartrate watch should not think that the person is sleeping, period. Unless only movement (or lack of it) is detected during sleep hours and HR is left behind, which definately sounds like a bug, in my opinion
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@aiv4r I think it is written somewhere in the manuals, that only movement is used for sleep tracking.
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@vietpq Was the watch resting on the table HR sensor down? Maybe it thought it was on the wrist even with no heartbeat.
If so, next time try to rest it display down, or 9 o’clock down (on the side). -
@aiv4r Thanks! I double-checked, and it seems the watch actually continued to log heart rate data while it was just sitting on the desk.
That makes me think the algorithm doesn’t fully validate HR data against wrist detection — so it keeps assuming I’m asleep if there’s no motion during typical sleep hours.
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This is insane. I remember 9PP had an issue measuring HR when off the wrist, then it was fixed in 2024. And now they are back to square 1. Most likely they could’t reuse any of the OHR sensor code from 9PP due to different hardware and are writing it from scratch making the same mistakes.
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