Hmmm
The more I read about this the less inclined I’d ever be to use an overnight wearable to monitor HRV.
What’s critical is being able to repeat the measurement position. This is not possible when this measurement is taken at night. You could be lying on your back one night, your side the next, your stomach the next. Your arm could be above your head, at your side, under your head etc etc
This was highlighted in some article I read recently. Can’t remember who wrote it.
The single best way to provide consistent measurements is a morning reading. You can repeat the routine day after day, week after week month after month with a consistent measurement position. Pick your app to record, be it HRV4T, EliteHRV, iThlete, Kubios or whatever. Personally wouldn’t rely on an Oura or Whoop for a HRV analysis. The body position and time of the data collection cannot be repeatable with an overnight wearable.
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