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by brandonb·10y ago·view on hn ↗
Yancheng was awesome to work with. We + UCSF actually just launched a continuation of his work via the mRhythm Study:

  https://mRhythmStudy.org
If you have an Apple Watch, you can contribute data, regardless of whether you have a heart condition.
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I installed the app and I got a spike of 121 bpm between 4am-4;30am for the past couple of nights. That seems a bit strange. Nightmares? Buggy software?
Getting some spikes is normal while you're in REM sleep. Here's an example of restful sleep vs sleep after a night of drinking: http://imgur.com/l9RVeK5

In general, we'd like to add more comparisons in the app so that you know how your stats fit in to the larger population. Stay tuned. :)