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I guess it's a more complicated thing to implement (!= low hanging fruit), but I'd be more interested in sleep tracking than step tracking.

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Sure, but we can't do sleep tracking well. Todays devices mostly guess and map to typical patterns. Might, might not, work reasonably for you. But chances are that if you want to track your sleep because you suspect irregularities then they are about as useful as a potato.

The Apple Watch is quite accurate (according to Apple's own research, at least), and it doesn't guess or map to typical patterns: https://www.apple.com/health/pdf/Estimating_Sleep_Stages_fro...

From other anectdata the apple watch seems to just as bad as everything else.

We just don't seem to have any idea how to track sleep quality even with better devices than just a watch/whatever. Even a binary, is the person I'm attached to sleeping, is hit and miss. And with that in mind you can be pretty sure that the sleep stages etc is even worse.

The problem with sleep tracking watches is that simply wearing them alters your sleep patterns/quality.

YOU ARE CORRECT.

We should start looking at biochemicals soon - melatonin and cortisol release

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