Signs That Truly Matter Snoring is common. Sleep apnea is serious. Knowing the difference could significantly impact your health. What Is Snoring? Snoring occurs when airflow is partially obstructed during sleep, causing tissue to vibrate. It can be caused by anatomy, alcohol, allergies, or weight. What Is Sleep Apnea? Sleep apnea is a condition where breathing repeatedly stops during sleep. Obstructive sleep apnea (OSA) occurs when throat muscles relax too much and block the