T.N.
I wish I could offer you help. One of my oldest (twins) will be 7 next month and he still wets the bed. Even when I have cut off liquids at dinner time (5:30 ish...he goes to bed at 8:30) and even if I wake him up to go potty. My 5 year old also wets the bed, though he is off and on now and no longer consistently doing it. Their ped. said that there are things you can do like medicine and bet-wetting monitors. Her son is 6 and wets the bed at night, too. She has made the decision, just like us, to just let him grow out of it. Neither of my sons wear pull-ups, and I'm changing the sheets every day, but I'd rather do that than make him take meds or deal with a bulky monitor.
Good luck!