Understanding Sleep Apnea Sleep apnea is a common disorder that makes you stop breathing for short periods while you sleep. People with sleep apnea often snore loudly and feel very tired during the day. There are two main types of sleep apnea: obstructive sleep apnea (OSA) and central sleep apnea (CSA). - Obstructive Sleep Apnea (OSA): This happens when the airway narrows or gets blocked during sleep, causing breathing...