i have a good friend who is a nurse practitioner for a pediatric urologist, speciality is bed wetting. she told me the first hing they do is send kids for xrays to rule out constipation, in about 60% of the cases the kids are constipsted. they put those kids on miralax, usually takes 3-6 months but most of them stop wetting the bed after they get regular. It makes sense; full colon pushes on bladder so there is less room for the bladder to fill, bladder fils sooner, child wets bed. In addition a full colon will push on the bladder desensitizing it so the "full" signal doesn't get recognized and sent to the brain, child wets the bed. If you are struggling with bedwetting it's certainly worth ruling out constipation.