Sleep apnea is a serious condition in which a person stops breathing while sleeping. Most people do not realize they have this problem until a spouse or partner tells them. Symptoms of sleep apnea include loud snoring, daytime sleepiness, insomnia, lack of energy, and more. It is important to see your doctor if you suspect you have sleep apnea -- it can affect your overall health in a serious way. Follow the links below to find WebMD's comprehensive coverage about how to recognize symptoms of sleep apnea, what to do if you think you might have sleep apnea, and more.