You checked the internet about snoring. I... dude, people snore. A lot of people snore, I saw a video of a hummingbird snoring.
Yes the 2am note was immature, so is worrying about it possibly being a life threatening condition.
Just straight up go an tell him "Dad, you're snoring very loud and I can't sleep" And then together either get him an anti-snoring pillow or you some earplugs.
Also, stop using the internet to research 'medical' things, 98% of the time you'll convince yourself you have cancer for farting.