Researchers from the Swedish University Hospital Umea
questioned more than 15,500 people and found that nearly 20 percent of the
volunteers from countries such as Sweden,
Norway, Iceland, Denmark
were habitual snorers.
When asked to suggest a reason for their snoring, the
researchers received a number of replies including hospitalised for a
respiratory infection or growing up in a large family.
One common link the researchers found was the volunteers
being exposed to pet dogs early in their childhood, leading them to suggest
that pet dogs caused allergic swelling in the airways which boosted the chances
of becoming a habitual snorer by as much as 26 percent.