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Are you aware of modern consumer sleep-tracking headbands like Dreem and Philips SmartSleep? Considering these have an EEG, I find it hard to believe they're less accurate than an acti-watch.

Dreem has a self-run study that claims pretty great results [0], do you have any objections to their methodology?

[0]: https://www.biorxiv.org/content/10.1101/662734v1

Thanks for citing the study. Just read through the introduction and conclusion and the Dreem sounds very promising.

After reading Matthew Walker's "Why we Sleep", I currently use the deep sleep percentage metric provided by the Sleep as Android app to determine how well I sleep, and jot it down in a sleep log. The book has given me the idea that deep and uninterrupted sleep is hugely important, but obviously the app is only able to give a crude estimate.

Perhaps this headband would give me better insights into my (failings of) sleep. I hope the parent commenter replies to your message.

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