Sleep apnea (or sleep apnoea in British English) is a sleep disorder characterized by abnormal pauses in breathing or instances of abnormally low breathing during sleep. Apnea, apnoea, or apnœa, is a term for suspension of external breathing. During apnea there is no movement of the muscles of respiration and the volume of the lungs Central sleep apnea (CSA) or central sleep apnea syndrome (CSAS) is a sleep -related disorder in which the effort to breathe is diminished or absent, typically for 10