I have had this issue for several months and I can't decide if I should attach the blame to my bladder or pouch. My sleep has been so interrupted.
Every night , like clock work @about 2 a.m. my body wakes me up. There's a nagging (not hard) pressure in my lower abdemon in the vicinity of my bladder.
I empty my bladder, but that does not relieve the pressure. I empty the pouch and the pressure is gone. I've been able to wait until 7:30 to empty again, but like this morning we had round 2 at 5:30 a.m.
I have no problems during the day so I think positional have everything to do with it. Other than that, not sure in which direction to go to resolve this.