The sounds of snoring occur because of obstruction of the flow of air through the passages of the nose and back of the mouth. A flaccid soft palate will vibrate and obstruct the flow of air through the nose causing snoring and sometimes sleep apnea.
Forty-five percent of normal adults snore at least occasionally, and 25 percent are habitual snorers. Snoring tends to be more frequent in males and those overweight, and usually grows worse with age. Alcohol and sedatives can also contribute to snoring and sleep disordered breathing.