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'''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 to 30 seconds, either intermittently or in cycles and is usually associated with a reduction in blood oxygen saturation. It is a collective term referring to two breathing disorders: Cheyne-Stokes respiration and [[periodic breathing]]. CSA is usually due to an instability in the body's feedback mechanisms that control respiration. See also [[Complex sleep apnea]] where central apnea, hypopnea and obstructive apnea may be mixed together.