I juist got some happy heinys trainers off ebay for DD that I was planning to use at night while she is potty learning. But, since they do not have any closures, you can't lay them flat to stuff them. I had a really hard time getting them stuffed last night and couldn't put much more than one joey in them. She still needs more than that at night. If you have used these for a nightime trainer, what do you stuff them with and do you have any tips for making it easier??