Central sleep apnea is a type of apnea in which a person stops breathing during sleep. However unlike obstructive sleep apnea, CSA occurs not because breathing is blocked but because the brain fails to send the proper signals to your breathing muscles. It is much less common than OSA. People with CSA will be observed with pauses in breathing during sleep, but may or may not snore. CPAP used for treating OSA has been shown to help some people with CSA as well.