Is snoring causing a rift in your relationship? It affects about 90 million adults in America, but there is more-to-the-snore than it being just a nightly nuisance. In severe cases, snoring could be a sign of a life-threatening medical condition called sleep apnea. In the U.S., sleep apnea is as common as type 2 diabetes. Left untreated, it can lead to high blood pressure, heart disease and even stroke.