Sunday, August 19, 2012

Sleep Positions: Model X16-1C Accelerometer

I wear the Model X16-1C accelerometer at night, Velcro'ed to the top of my Quattro FX head gear.  The mask head gear is conveniently made to accommodate Velcro because that is how the head gear is adjusted.  I put the accelerometer on the top of my head because there's a strap there to attach to and it's out of the way of my nightly movements.  The accelerometer records X, Y, and Z positions into text files from moment to moment, which I capture and record into a database.

I "calibrated" the meaning of the X, Y, and Z values by putting my head and body into known positions for a while and then looked at the values.  The chart below shows last night's data with some notations about sleeping position.

From this data I can tell what sleeping position I'm in when and how often I'm changing positions.  In the beginning I go to sleep on my tummy with my head to the left, but later, in the middle of the night I tend to roll onto my back, then back on my side again, and back and side... etc.  Near the end of the night you can see that I'm starting into a waking process during sleep as on the far right I become more active, changing positions / moving frequently.

In another posting later I'll show how I relate positions to my brain waves from the Zeo and my breathing and apnea events.


  1. Picture is inspiring. With dedication, you could optimize your sleep better than 99.5% of people.

  2. Indeed! We can turn a "malady" into a strength! My Zeo sleep score is running about 80 on average presently, over the last 2 weeks. I'm sleeping better than people much younger than I am.