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restriction or collapse during inspiration. It takes very little pressure to make this happen and the
negative pressure of the airway during inspiration increases the restriction. This has been
confirmed in at least one medical study [[1]] . <brref>Effect of Jaw and Head Position on Airway Resistance in Obstructive Sleep Apnea Choi JK, et al., Sleep and Breathing, 2000;4(4):163-168. https://www.ncbi.nlm.nih.gov/pubmed/11894202 <br/ref>To demonstrate this, sit relaxed in a chair and take a couple of deep breaths. Then let your chin
drop to your chest, take more deep breaths, and note the increased resistance. This is a common,
perhaps the most common, form of what we call positional apnea and, as previously mentioned,
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