My Dog Is Peeing Himself When He Sleeps, Can You Help?

Dogs should not urinate while sleeping.  The bladder muscles should maintain tension to keep urine in the bladder.  Incontinence can be due to irritation of the urethra, irritation of the bladder, bladder stones, infection, muscular or neurological abnormalities.  
As dogs age incontinence can become a problem due to cognitive issues, arthritis issues (pain when posturing to urinate or get outside to urinate), and the above medical problems.
Have your dog examined by a veterinarian.  The first step will be to run a urinalysis.  Medications will be prescribed to treat the primary problem and also are available to help tighten sphincter tone.

Sounds pretty normal.... They might have training for that

OK try extensive training, the dog needs more training.....the best to you