Sleep apnea is a common and potentially serious sleep disorder characterized by interruptions in breathing during sleep. These interruptions are known as apneas and can lead to disrupted sleep patterns and several health problems. There are two primary types of sleep apnea: obstructive sleep apnea (OSA) and central sleep apnea (CSA), with obstructive sleep apnea being the most common. If you snore loudly and feel tired even after a night’s sleep, you might have sleep apnea.