Well, Olivia has worn the Potty Patty waterproof 2-in-1 training pants to sleep in for about 4 nights. The first night she stayed dry and didn't get up to go pee in the middle of the night. The next night she peed and it leaked around 5 a.m. Saturday night she slept over her friends house and we had to pick her up at almost 12 a.m. because her friend kept waking her up. So she peed a little in it. Last night she came downstairs after being asleep for maybe a half an hour. She was sleepwalking and we couldn't tell she was wet (she sleepwalks occasionally), even when my husband picked her up to bring her back to bed. She came down 5 minutes later to tell us she had peed in her sleep. The bed was wet.
So I'm still glad I bought these because I have to do laundry EVERY DAY in this house so I can easily throw her sheets and pull-ups in the wash without doing extra loads. I'm also glad that I am no longer contributing to the gazillions of pull-ups in the landfills. And they are making her wake up when she pees which was one of the reasons I bought them. They are also absorbing the majority of the pee. However, if you are looking for a truly waterproof cloth pull-up these are not it!