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Comment by fromthestart | Hacker News Reader

...is this an advertisement?

Also, as appealing as the device sounds, I'm terrified of giving this kind of personal data away to a tech company:

>Dreem works as a long-term sleep expert and one-on-one coach: it monitors your sleep habits and sleep quality for a week, asks you for a lot of more details about your life (day and night), and downloads your activity data from other personal health apps

The overly suave marketing on the dreem site makes me wary as well. Between personal data abuses and shady marketing practices, how is anyone supposed to trust modern tech anymore?

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Hi, I am the author of the mentioned article. It is not an ad :). In fact, I am Czech publisher of Matthew Walker's book "Why We Sleep" (mentioned in the article) and a bit lifehacker too – blogging in Czech-only until recently. I just wanted to check if my suspictions about the most hyped sleep-trackers are legit but waited for something better to compare them with. I believe Dreem can be used for this task, but, sure, it is not perfect – some people report worse EEG signal quality and thus less effective stimulations. Dreem removed weekly reports in last app update and there is nothing like Oura Cloud for "data mining" in Dreem, which is really a miss! I finally bought another Dreem2 for my mother, so I have to translate everything from English to Czech for her but I want to try to help her with her terrible sleep habits. The article will probably continue one day with my longitudial results (tested on me and her too). Ask whatever you want, I will try to answer. Best, Tomáš

Ad or not, one of the best sleep science overviews I've read.

I want to know whether one can get their nightly EEG data.

The normal data export only includes summary data for each night in csv:

  Type (sleep, nap, relax)
  Start Time
  Stop Time
  Sleep Duration
  Sleep Onset Duration
  Light Sleep Duration
  Deep Sleep Duration
  REM Duration
  Wake After Sleep Onset     
  Duration
  Number of awakenings
  Position Changes
  Mean Heart Rate
  Mean Respiration CPM
  Number of Stimulations

Not sure if there's any way to get the raw sensor data.

There appear to be two terminals on the band which are not used by the normal user. I assume they are for flashing the firmware on bricked devices.

They don't give you the raw data, I emailed support a couple months ago and their response was:

"Unfortunately, we do not provide you with a raw data report containing your EEG data. However, we do provide it via user-friendly hypnogram via the Dreem app."

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