Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. If you snore loudly and feel tired even after a full night’s sleep, you might have sleep apnea. The main types of sleep apnea are: Obstructive sleep apnea and Central sleep apnea. Obstructive is the more common form that occurs when throat muscles relax. Central sleep apnea occurs when your brain doesn’t send proper signals to the muscles that control breathing. The most common symptoms for both types include loud snoring, gasping for air during sleep, awakening with a dry mouth, morning headache, insomnia, daytime sleepiness and irritability.