Snoring is bothersome to others, but it can also be a sign of a more serious condition known as obstructive sleep apnea (OSA), which is present in three percent of the general population. OSA is characterized by multiple pauses in breathing greater than 10 seconds at a time due to upper airway narrowing or collapse. This lowers the amount of oxygen in the blood, and causes the heart to work harder. Because the snorer does not get a good rest, they may be sleepy during the day, which decreases their performance. Untreated OSA can contribute to high blood pressure, stroke, heart disease, workplace or motor vehicle accidents, and more.