Have him tested for sleep apnea. OTC helps are the mouth guard that was mentioned and/or nasal strips that hold the nose open. Addressing sinus or allergy issues should help (cortico-steroid nasal sprays are a huge help in relieving sinus issues). Differernt sleep positions may help.
I snore when my asthma is bad, not much when it isn't.
I snore when my asthma is bad, not much when it isn't.