Hi Yaming,
my dad was a heavy snorer all his life and it eventually led to sleep apnea, I think during his fifties. He refused to do anything about it, perhaps also because he never could see and hear himself sleeping (so he couldn't imagine how bad it was), and this damaged his heart and dramatically lowered the quality of his life (heavy dreams each night, sleepiness all day, weakness.)
A couple years ago he obtained a CPAP device, and everything changed for him over night. He is very happy with it, although it's looking a bit funny.
edit: he is also overweight.