Hi, Melodie,
My guess would be that something you ate/drank acted as a diuretic...I have had that happen with my neobladder after eating watermelon, a known diuretic. You might want to make note of what you had consumed prior to something like this happening so you can find out if there are certain foods/drinks that affect you this way. The only other explanation that I can think of is if you were unable to completely empty your pouch right before going to bed. As a side note, all of us with either catherizable pouches or neobladders do need to keep in mind that urine production does not slow down during sleep the way it did with our native bladders because the hormone signals between the native bladder and kidneys no longer occur. This often means those of us that do not wake-up on our own in time to keep the pouch/neobladder under the 400-500cc recommended maximum must use an alarm system to protect our neobladder/pouch from over stretching.
Since the sensation of fullness does not awaken me until way over the recommended amount, I set an alarm for 3 hours after I go to bed and then 4 hours after that...my alarm clock lets me set two alarm times. I go longer the second shift because I have not been drinking any liquids while sleeping. I do not reduce my liquid intake in the evenings so 3 hours is a good first alarm time for me.
There are good reasons for the 400-500 recommended maximum volume for the pouch/neobladder. The more they are stretched, the more likely they are to rupture...just like a balloon is more likely to burst the more you blow it up. Also, with neobladders, continually overfilling can lead to a "floppy bag" that cannot be emptied completely without catherization. Plus, the pouch/neobladder is made from intestine that absorbs solutes back into the blood stream, the larger the pouch/neobladder is stretched the more surface area there is for the toxins in the urine to be reabsorbed into the blood stream. As one of our members likes to point out, urine is a waste product and should be disposed of promptly. It should also be noted that the 400-500cc is the same amount a normal native bladder generally holds.
Afraid I got a little carried away here, but hope you are able to discover the cause of the overfilling and thus beable to control it in the future.
My best to you,
LindaW