How can SENSUS detect when I’m sleeping? Why does it matter?

Thursday, November 13th, 2014

SENSUS can detect the orientation of your lower leg, thanks to a built-in piece of hardware, called an accelerometer.  If your leg is in a horizontal, or near-horizontal position for an extended period of time (1-2 hours or more), SENSUS will know that that you are most likely asleep.  If your device is set to automatically restart therapy every other hour, SENSUS will reduce the therapeutic intensity you experience during sleep by roughly 20%.  This reduction in intensity should allow you to retain the pain relief benefits of SENSUS, but minimize disruptions to your sleep as the device cycles in and out of active therapy sessions throughout the night.

If you are watching a little TV with your feet up and get up periodically, the sleep detection will not impact your normal therapeutic intensity level.  In any case, you will be able to tell whether your device is in sleep mode by looking at the blinking light on the front of the device.  The green light will blink once per second during a normal therapy session, but only once every five seconds while it is in sleep mode.  You don’t need to do anything special to get your device out of the reduced sleep intensity mode.  Once you are up and about for more than a few minutes, the device will automatically revert to your normal therapeutic intensity the next time it restarts a therapy session.  However, we do recommend that you remove your device for a period of time after waking up to prevent skin irritation.  When you put SENSUS back on and start therapy, the device will restart at your normal intensity.

Posted by NeuroMetrix in SENSUS Operation