Hi @msclark, thanks for getting back to me with the screenshot that I requested. Now, let me explain to you that Fitbit estimates your sleep stages using a combination of your movement and heart-rate patterns. While you’re sleeping, your device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages. If we don’t have enough information on the backend to calculate this, we’ll show you your old sleep pattern which doesn’t require heart rate. It appears as though we didn’t have enough information, and as a result showed your old sleep pattern. We apologize for any inconvenience this may cause. However, if you have tried every single tip to correctly wear your watch, and still not getting detailed sleep stages, I'd like to add that Fitbit’s heart rate technology used to calculate Sleep Stages was designed and developed by Fitbit over years of research and testing. As with all heart-rate monitoring technology, whether a chest strap or a wrist-based sensor, accuracy is affected by personal physiology, location of wear, and type of movement. We sincerely apologize for this inconvenience, and recommend visiting our help center to learn more about Sleep Stages.
Let me know how it goes!
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