Kevin Kennedy-Spaien over Health-Hack suggests that the sleeping position of snorer will help – Snoring happens usually when one resting on the back. He suggests to put a tennis ball on the center of the back so that one won’t rest on the back:

… Our relatively simple hack for this is to encourage the snorer not to sleep in this position by stitching a tennis ball to the center of the back of a pajama top or T-shirt. If the snorer wears the specially-prepared top/shirt, back-sleep will be too uncomfortable and the snorer will self-correct his/her sleeping position, usually without even waking up…

Howto: How to prevent snoring – [Health-Hack]