I have a 16 month old that is a horribly inconsistent napper. Some days it is as short as 30 minutes. Longest is 1 and a 1/2 hours. My question is if she only sleeping for 30 minutes how long would you leave her before getting her up? She is not quiet, wakes up crying. She is separate from the other kids so not to disturb them. I don't want to leave her crying, but at the same time I need a break!