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In page Obstructive sleep apnea:

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Some adults with OSA are obese. Obese adults show an increase in pharyngeal tissue which cause respiratory obstruction during sleep.[2] Adults with normal body mass indices (BMIs) often have decreased muscle tone causing airway collapse and sleep apnea. Sleeping on the supine position is also a risk factor for OSA. The supine sleeping position generates mandibular retraction and tongue collapse which constitutes an anatomical basis for respiratory obstruction during sleep.