“up your nose” are tubes that connect to your trachea which brings air to your lungs. Those tubes A. are normally muscular and the muscles keep them open and B. are a place that fat can accumulate.
For conscious, healthy people the tubes are kept open by the muscles and are spacious enough for quiet, healthy breathing.
For sleeping people the muscles will relax causing the tubes to collapse a bit, typically this isn’t a huge problem as the tubes should still be wide enough for healthy breathing.
For overweight people the tubes can also get chubby, reducing the space air can flow through. Combine this with sleeping and the muscles going weak means collapsed tubes you can’t really breath through. Hence – snoring.
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