My oldest step son wet the bed almost every night until he was 8 or 9 years old. We took him to all the right doctors. After they ruled out medical issues we tried a device in his night time panties (the depend type of things) It was a sensor that would go off if he started to go, we set it to wake him up, he would go to the bathroom and relieve himself. After about 2 months of using the thing, he started going through the night without the sensor going off.
Good Luck!
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Its been a few years but I think we got it at a local pharmacy. It had sensors that Nick put in his pull up and then attached the alarm to his tee shirt. If he started to go, the alarm sounded and woke him up.
I found this in an article online
"Use a bed-wetting alarm device.
If your child reaches the age of 7 or 8 and is still not able to stay dry during the night, an alarm device might help. When the device senses urine, it sets off an alarm so that the child can wake up to use the toilet. Use this device exactly as directed so that it will detect the wetness right away and sound the alarm. Be sure your child resets the alarm before going back to sleep.
These alarms are available at most pharmacies and cost about $50. Although they provide a 60 percent to 90 percent cure rate, children often relapse once they stop using them. Alarms tend to be most helpful when children are starting to have some dry nights and already have some bladder control on their own."
Here are some links to purchasing them on line-
http://www.bedwettingstore.com/category_alarms.htm?gclid=...
http://www.dri-sleeper.com/cgi-bin/runisa.dll?sb:drisu::c...
http://search.ebay.com/bedwetting-alarm_W0QQcrlpZ63402309...
http://www.google.com/products?sourceid=navclient&ie=...
Good Luck!!!D.