Buy him these (examples of recommended products only, not specific name/brand/item recommedations, please do your own research for best fit for your circumstances and budget) 1. Anti snore nasal strips. https://www.amazon.com/dp/B075JGT4R9/ref=cm_sw_r_cp_awdb_t1_LbYODbT5GATG0 2. Adjustable mouth guard for snoring/teeth grinding https://www.amazon.com/dp/B07VZ35ZC5/ref=cm_sw_r_cp_awdb_t1_0eYODb3WM1AAS
Many snorers have chronically blocked sinuses (that's why even non-snorers tend to snore when they have a cold) so the nasal strips help open them up for better, quieter breathing. Also, if he has apnea, his throat is closing and the snore is from the air being forced through the closed or severely restricted space (obviously). The mouth guard can help his jaw and throat align better for better breathing.
Buy them, give them to him with something like: Dude, your snoring is killing me, and I think it's really serious. I can't sleep through it, it's so loud. I really think you should see a doctor, but for now would you just try these please to see if they'd help? Sleep apnea can have major negative impact on your life and health, so I want you to get checked out so you don't cause long term problems. But I also want to sleep myself, now.
I am NAD but these are things that helped me on my journey. I have confirmed sleep apnea now, used a cpap for a while, became CPAP intolerant, now use a $4500 custom mouthguard and earplugs and sleep better than I have in years.