Brian said: There are several
causes of bed wetting - but why would allergies be a cause?  --- because
allergies cause inflammation and swelling of the tissue lining the airway -
thus reducing the size of the airway - thus making it more difficult to
breathe - and more prone to closure and causing an obstruction.... All
kinds of chemical things can happen, but again
to keep it simple,  the abdominal pressure for that "snort" can put pressure
on the bladder and cause it to release.  Factors include: development and
strength of sphincter, fullness of bladder, medications, degree of
sleepiness, etc.

I agree. But while this is one route to incontinenece, it doesn't always
need the snort for allergy to cause bed-wetting: allergy also causes
inflammation not only of the throat but also the bladder and swelling and
irritability, just as in other areas of the body. Antigen is being excreted
via urine (another reason some kids get nappy scald, or inflammation
wherever their urine touches the sensitised skin.) So simply an
over-sensitive bladder can try to get rid of teh irritating agent, just as
the gut goes in for diarrhoea to get rid of iirritating agents. Bedwetting
as a sign of allergy is very copmmon, and urinary frequency/incontinence in
teh daytime can be too. Maureen.