Being poked in the ribs from the other side of the
bed is never fun, particularly considering the fact
that nobody chooses to snore - it just happens.
As we sleep, muscle tone relaxes throughout the
body, including the upper airways. If there's any
sort of obstruction or narrowing up there, the
flow of air results in rumbling vibrations of the
soft tissue at the back of the throat.
Obstructions of the snore-inducing kind can be
various - a really common one is obesity,
because there's extra fat on the neck, weighing
down the relaxed throat muscles during sleep
and narrowing the airways. If you've ever had a
flatmate who sounds like a chainsaw after a big
night out, you already know that alcohol is a
fairly typical cause of snoring, too - this is
because alcohol is a relaxant, and a more
relaxed throat results in louder snores.
Other problems that lead to snoring include nasal
congestion due to a cold or allergies; swollen
tonsils; or possibly anatomical problems, such as
a bent nostril (typically from a broken nose), or
enlarged tongue, or even adenoids. Some people
try to avoid sleeping on their back because
snoring appears to get worse - this is because
the tongue falls back and compresses the
airways.
For overweight people the first advice is to try and
drop a few pounds, because even moderate
weight loss can reduce the thunderous
vibrations.
If you snore only while on your back, so-called
positional therapy can help - it doesn't do away
with snoring, but instead helps position your
body at night so that sleeping on your back isn't
an option.
http://www.sciencealert.com/here-s-why-some-people-snore-and-how-you-can-stop-it

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