Sleep apnea, respiratory condition characterized by pauses in breathing during sleep. The word apnea is derived from the Greek apnoia, meaning “without breath.” There are three types of sleep apnea: obstructive, which is the most common form and involves the collapse of tissues of the upper airway; central, which is very rare and results from failure of the central nervous system to activate breathing mechanisms; and mixed, which involves characteristics of both obstructive and central apneas.
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