My 10 year old son also has this peeing problem. He gets up several times a night and if extremely tired he wets the bed. I am interested in this DDAVP as I am sure this would help him, so thank you for posting about this. I have thought getting up  breaks his sleep and then this adds to his tiredness especially in the mornings. Like others we tried hard in not letting him drink at night be is always thirsty. I get him every night before I go to bed and it still makes no difference. He is also a salt loser.