Context:
- Apple's bedtime isn't good enough. Need a better solution.
- Must integrate with Apple HealthKit.
- I travel a lot, so the ideal solution is compact.
- Optimizing for data accuracy 1st, data points 2nd.
- Wearables like Oura ring are fine, but I prefer non-wearable.
Disclosure: #FitbitEmployee but I don't speak for Fitbit.<p>Any Fitbit with heart rate will give you maximum acccuracy according to <a href="https://www.wareable.com/fitbit/fitbit-sleep-tracking-defining-feature-6496" rel="nofollow">https://www.wareable.com/fitbit/fitbit-sleep-tracking-defini...</a><p>Heart rate is key to getting good sleep stages data, so a non-wearable won't do. <a href="https://blog.fitbit.com/heart-rate-during-sleep-stages/" rel="nofollow">https://blog.fitbit.com/heart-rate-during-sleep-stages/</a><p>To integrate with Apple HealthKit you need a 3rd party app.
Out of curiosity: What makes it not good enough?<p>I use a Fitbit, and I really have no idea how good the data is: I'm asleep at the time it's being collected.