Central sleep apnea, one of the least common of the 3 types of sleep apnea, occurs when your brain cannot successfully send messages to your breathing muscles. Milder cases are often overlooked as symptoms may often be diagnosed as mild insomnia, chronic migraines, or just a bad case of snoring. If you experience any of these symptoms, or notice mood changes, difficulty focusing during the day, shortness or breath, waking up often in the middle of the night, or abnormal breathing patterns, you should consult with your doctor and find out if a sleep study would be appropriate for you.