i can't imagine a more restful sleep, than on a boat...unless you have sleep apnea or claustrophobia
CPAP (continuous positive airway pressure)will eliminate the self conscious aspect of snoring, and will improve the quality of your sleep measurably. you will need a sleep study, and if deemed medically necessary, insurance picks up a significant portion (YMMV).
i'd avoid any of the quarter berths, instead opting for saloon or, cockpit sleeping (i still prefer sleeping on deck, just not as comfy as down below).
if you can work through these two issues, you'll be golden...
good news, you didn't say the thought of being on a boat made you nauseous for days