Millions of people snore when they sleep. Genetic factors could cause snoring, as well as one’s sleeping position or underlying health condition. According to sleep medicine specialist Lisa M. Cannon, M.D., the sound is caused by a heavy flow of air that blocks the breathing pathways. This can cause vibration in areas such as the soft palate, uvula, tongue, and others. The space in the airways diminishes as muscles in the neck and throat relax along with the rest of the body.