Hi @birdieman. Welcome to the fellowship of bladder cancer survivors. Mine -- a group of epithelial papillaries -- were surgically removed 13 years ago, and like you, I have had regular cystoscopies to watch for more tumors. None has turned up so far. I suspect your "overactive bladder" is similar to mine, although I don't regard mine as overactive. I think I have lost space in my bladder, forcing me to urinate more often -- especially overnight. I also suspect that my bladder lining is more sensitive on one side than the other, so I try to sleep with the sensitive side up and above accumulating urine. My guesses are based on the fact that most times my urine is not strong or high volume. In my case, the problem might be related to medications I take for hypertension or to a syndrome related to hypokalemia or to a "mass" on one of my adrenal glands (which could be pumping excess aldosterone into my blood). I'm working on these issues with a nephrologist and a urologist and an endocrinologist. Let's keep in touch so we can share information. Martin