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They are all garbage, without monitoring brainwaves you have essentially zero useful information about sleep quality/duration/stages. No amount of accelerometer/heart rate data is going to accurately reflect your sleep stages, regardless of what marketing spiel you read.

For a brief time there was a consumer product "Zeo sleep monitor" which was a legitimate EEG-style brainwave headband you would wear to sleep. From what I recall, comparing it's results to those of in-lab sleep studies, it was fairly accurate.

Sadly they went out of business as it was a fairly niche product and pretty expensive.






The Dreem is the modern version of what you're mentioning. https://dreem.com/en

Wow I had no idea this existed! I checked for competitors a few years back and there was nothing at the time, so this looks relatively new - and also quite promising. I'm glad I clicked on this HN link, thanks for the pointer.

I fear they may follow the same course as Zeo at those prices though. For typical consumers I would imagine only the most fervent "quantified self" types are going to be comfortable spending $500 for sleep tracking.

I'm interested though :)


> Sadly they went out of business as it was a fairly niche product and pretty expensive.

However, their Android app is still on Google Play, and you can find used models on eBay. There's also a cottage industry making replacement headbands (which wear out).

At least there was 3-4 years ago when I last used mine. I haven't tried it since.




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