Tripped on this this morning.
https://hackaday.io/project/108585-hacking-a-25-nrf51-arm-cortex-activity-t=
racker
Interesting in it's own right, and somewhat related to this conversation.

Opening a specific make/model of fitness tracker and using it as a general
development platform for that microcontroller.

-Denny


On Thu, Apr 5, 2018 at 12:54 PM, Art <ky1k@myfairpoint.net> wrote:

> Hi Denny,
>
> The fitbit and Apple monitoring you mention is an accelerometer,
> attached to body limbs. They detect how much the patient moves in the
> night in order to evaluate whether the patients paralysis is normal
> during sleep AND whether the patients eyes open when they are in normal
> sleep paralysis. These functions are controlled in a part of the brain
> just above the brain stem, and an abnormal correlation often indicates
> the patients need for B6. Note that serum B6 in the blood is useless-the
> cells have to be examined directly because it's what's on the inside of
> the cell that counts! Video and sound perform a similar function and
> additionally the sound can monitor breathing to see if breathing
> actually stops during sleep!
>
> I ordered a 32 GB SD card for my cell phone and plan to take some
> overnight video (with sound) soon.
>
> Regards and ty for the info!
>
> Art
>
> On 04/05/2018 01:38 PM, Denny Esterline wrote:
> > Some of the "FitBit" type activity trackers have some kind of sleep
> > monitoring functionality built in.
> >
> > The other fairly simple answer would be to time-lapse video yourself
> sleep
> > and evaluate it manually after the fact.
> >
> > -Denny
> >
> >
> >
>
>
>
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