Men never snore... it's physically impossible...
Seriously, snoring may be a symptom of sleep apnea (interrupted breathing), which can be dangerous, as it leaves you tired even after sleeping, as well as other problems. If it's available, a night in a sleep lab will tell for sure. I was diagnosed with apnea, but only when I slept on my back, which I don't normally do. Actually, sometimes I sleep on my back on the couch, and then my snoring wakes me up
Good that earplugs work for you, but a sleep lab test might be best for your wife.