As you toss and turn in your sleep you inevitably wind up on your back, a sleeping position that per medical institutions further aggravates the collapse of the airway if you snore.

Major US clinical institutions conclude that by not sleeping on your back you may stop snoring altogether or reduce its frequency, or at least lessen its loudness or its intensity. 

The Sleep Side Keeper is meant to help you maintain your sleep side and NOT sleep on your back.

It is a nonintrusive pad that lies on the mattress on a non-slip mat that keeps it in place. It buzzes with a low pitch as light pressure is applied to it when you shift and lie on your back.  When relieved of pressure, it will deactivate; you will rarely notice it or rarely wake up when activated.