My husband was a snorer & eventually got diagnosed with sleep apnoea.He was a back sleeper too.He now wears a small backpack stuffed with towels ,when he goes to bed.This stops him rolling onto his back.Initially it used to wake him up,but he got used to it.No more snoring & thankfully no more apnoea.[His driving licence was revoked for a while]There are lots of suggestions on sleep apnoea messageboards.It only took him a few weeks & then the Sleep Clinic said his snoring & apnoea were under control & he got his licence back.You probably don't have apnoea yet,but longterm snoring can lead to it,according to the Sleep Clinic.Nip it in the bud now.Good Luck.