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What Customers Are Saying. The Zyppah is one of the best anti-snoring devices on the market, and itâs clearly the best mouthpiece by far. That being said, words donât mean much unless they have something to back them up, so weâre going to look at the positive and negative things previous customers have had to say.
Snoring can occur during any stage of sleep but is more common during stages 2, 3, and 4. This is because airway elastance and muscle tone due to sympathetic activity and neural output to the upper airway walls are different during rapid eye movement (REM) and non-REM sleep.