I am posting this as after 11 nights of attempting the bed wetting alarm with my 8 year old as I think we are going backwards!
He is a very deep sleeper and for the first couple of nights was waking after having a small accident to make it to the toilet for the rest. The problem for the past couple of nights is that he is so tired from waking twice a night he is actually sleeping through the alarm and totally emptying his bladder before waking up :-(
I know the alarm can take a while to work and I do want to preserve, I just wondered if anyone else had found this with their child. I also don't think it helps that he struggles to hold his wee at the best of times, so being tired and trying to do this just doesn't seem to be working for him 
Any hints or tips greatly appreciated. I always thought he would grow out of it eventually, but am now thinking we may need to see the doctor for some advice.