http://www.entnet.org/snoring.html
American Academy of Otolaryngology--Head and Neck Surgery
Forty-five percent of normal adults snore at least occasionally, and 25 percent are habitual snorers. Problem snoring is more frequent in males and overweight persons, and it usually grows worse with age. This online patient information document discusses snoring, including what causes snoring, obstructive sleep apnea, snoring treatment, self-help for the light snorer, and more.