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by throwaway9d0291
2426 days ago
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I think the problem is that most sleep trackers try to judge sleep based on heart-rate, which I don't think is valid. There are a few sleep headbands that use an EEG though and in my experience they've been reliable (e.g. mine correctly judges when I actually fall asleep and has correctly judged that I was in REM sleep when I woke up from a dream). |
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