This makes me mad to read that parents would punish this child for wetting her bed while sleeping!!! When we are asleep, we cannot necessarily control what our bodies do...this takes time to get! If I were you, I would tell the parents that you cannot and will not punish a child for such a thing and that making her sit out at snacktime is actually more like abuse than discipline (well you might not want to say it like that...LOL). Let her wear a pull-up until she is able to control her bladder while sleeping. She isn't aware that she is doing it...she cannot possibly be doing something on purpose while she is asleep!!! This is ludicrous! Honestly, I am not sure if I would even want to work with these parents...but definitely you need to put your foot down and tell them that you will not do these things at daycare and pull-ups need to be provided for sleep time (or waterproof training pants).