What causes of Sleep Disordered Breathing (SDB – Obstructive Sleep Apnea, Snoring and UARS)?

So, what causes this airway narrowing or closure in obstructive sleep apnea and snoring?

Abstract: The cause is simply partial or complete closure, or obstruction of the airway at one or more levels, it may be pressure from the outside (anatomy, fat, etc.) or the inside (anatomy, muscle wall, etc.)
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