Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts during sleep, causing snoring, gasping and daytime tiredness. If you snore loudly and feel tired even after a full night's sleep, you might have sleep apnea A Sleep Study is generally done to confirm the diagnosis The main types of sleep apnea are: Obstructive sleep apnea (OSA) the common form, that occurs when throat muscles relax, the tongue falls back and blocks the flow of air into the lungs Central sleep apnea (CSA), which occurs when the brain doesn't send proper signals to the muscles that control breathing Treatment-emergent central sleep apnea or complex sleep apnea, which happens when someone that has had OSA converts to CSA during therapy for OSA