As title says, Sleep tracking is showing me as being awake for 20-30minute periods in the first half of my sleep.
Normally 4 or 5 of these, even though I am sleeping right through.
Had the same issue with my FR255 - is there a way of resetting the sleep tracking?
When using high quality HR and HRV measurements, the Firstbeat algorithm has an average agreement around 66%. This means that each block of 5s of sleep has that chance of being assigned to a sleep phase that a sleep expert would assign using polysomnography tools. As a reference, sleep experts have an agreement of around 85% among themselves.
As the white paper says, this is "reasonably" good. In real life, the HR and HRV data from the wrist HR will be much worse than ECG devices. So you can assume that the accuracy of sleep phase classification will be (much) lower than 2/3. Several users, including me, report that the awake/sleep detection is poor (resulting in false nap detection, false sleep during slow/no activity periods, or under reported awake periods) while the algorithm accuracy is 94%! That tells me something about the degradation after taking into account data collection and/or specific implementation limitations/choices.
Accuracy can vary widely depending on the individual, both at the algorithm level and at the data collection level.
As Etupes25 posted, there is going to be variance among the general population. So it's possible a lower heart rate is throwing it off. I wear an oura competitor called RingConn. For funsies here's some comparisons.
