I ' m gonna call bullshit on this a little bit . It might be partly true , but there ' s another factor as well . I don ' t wake up to pee . I hold it in . And my body using ADH to regulate my urine production isn ' t the reason I can hold it in . There are times when I ' m drinking coffee all night , and get to the point where not even the coffee can keep me awake anymore . Sometimes I have a completely full bladder but I ' m too fucking tired to get to the toilet , so I just lay back with the light and TV and everything on and pass out , while already in a barely able to hold it in state with a full belly of coffee and coffee completely fucks with your water balance , regardless of what your body does with the ADH . I will wake up a few hours later , had not wet the bed , and my full bladder feels less urgently like it needs to be emptied than it did when I was falling asleep . . tldrconclusion pretty sure adults just have stronger bladder muscles and are able to hold it in even if their bladders are full , because I can fall asleep with basically a full bladder .