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Snoring - Symptoms. Symptoms of snoring. Snoring is when you make a noticeable sound when you breathe in during sleep. The sound is caused by soft tissue at the back of your mouth, nose or throat vibrating. The exact sound you make will depend on the type of soft tissue that's vibrating.
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.