A tiny bit of background: I have a hefty mix of functional and urge incontinence from years of unpotty training and diaper wearing.      Last night as I was dosing off I had this weird sensation where a felt just a tiny bit of bladder fullness followed by the sphincter muscle clenching tightly, followed by difficulty getting the muscle to relax.  It was sort of like how it used to feel back when I had bladder control and the muscles were set to default contraction mode.  After a few minut