It's great to have you here @Paulinemutch! You need at least 90 minutes of sleep, in order to have sleep stages shown in your Dashboard. I would like you to restart your Blaze and keep track of your sleep to see if you get the sleep stages.
Fitbit estimates your sleep stages using a combination of your movement and heart-rate patterns. When you haven’t moved for about an hour, your tracker assumes that you’re asleep. Additional data—such as the length of time your movements are indicative of sleep behavior (such as rolling over, etc.)—help confirm that you’re asleep. 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
Hope this helps.
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