Extracting my data from the Hello Sense sleep tracker

A semi-decent heart rate monitor (even a Fitbit) is all you need to track sleep quality, I think. It's also much more reliable to detect when you fall asleep vs motion sensors (alone). If I have a good nights' sleep, my heart rate plummets quickly and pretty much flatlines for 7 hours.

I can see the difference if I've been drinking alcohol, if I was woken up in the night or if I'm ill. All of these things tend to produce either an elevated heart rate, or a heart rate that slowly declines over the night (rather than a steep initial drop).

The study is cool, but is there a comparison to a control instrument that can actually detect REM sleep? My conclusion from that graph was that none of those trackers are any good at telling you at which point you are in your sleep cycle, but most are OK at guessing your bedtime.

With some small research, it looks like there is some bits and pieces around;

https://github.com/chendo/sense-api.cr https://www.chameth.com/2016/04/10/sense-api/

You're right, I've fuzzed those out but anyone can still pull it out of the app. Seems like a bad idea to have those hardcoded client-side, so I'm not sure why Google requires developers to do this.

Edit: actually I think the value that is exposed is the token ID, not the token itself. I haven't used Google Cloud Manager before myself, so maybe someone can confirm.