PineTime Sleep Tracking

[eFqLLnGo]

We've only got movement (accelerometer) and heart rate, neither of which are particularly good indicators of sleep state from what I've read. The heart rate is rather inaccurate at the moment too, by more than enough to throw off sleep state estimates. Some argue that wrist mount...

I was surprised by your statement and looked up a few studies. I find them pretty encouraging. For example this one : https://academic.oup.com/sleep/article/4...login=true
Quoting the conclusion :

Data from multisensor consumer wearables are strongly correlated with reference devices at the epoch level and can be used to develop epoch-by-epoch models of sleep–wake rivaling existing research devices.

So I'm still quite hopeful about this and will try and give it a go in the next few months.