Sleep apnea is a condition that affects your breathing while you sleep. It can cause you to stop breathing for short periods of time, which lowers your oxygen levels and disrupts your sleep quality. There are different types of sleep apnea, but the most common one is obstructive sleep apnea (OSA). This happens when your throat muscles relax and block your airway. Some symptoms of sleep apnea are loud snoring, daytime sleepiness, morning headaches, and dry mouth. Sleep apnea can increase your risk of high blood pressure, diabetes, heart problems, and other health issues. It is important to get diagnosed and treated for sleep apnea if you have it.