I had the same problem with Bella. We couldn't figure out when she would go after eating. So we stuck a paper to our fridge and marked down how long after she ate and drank it would take her to go. Now we haven't had a problem in a cpl weeks. For at night all i do is stop feeding after 630. And then go for a run right before bed and she sleeps like a baby all night. I know It's frustrating but they'll learn!