i use the pop in with the night booster overnight and so far no leaks and pippa sleeps upto 14 hours overnight. I think my problem is going to be how long they will fit her for, she's only 5 months/ nearly 16lb's and we have them on the biggest setting and there's not much room left to adjust them on the velcro. What i'm wondering is when they no longer fit if i could use the inserts in a wrap. There so absorbant and don't really want to have to buy more nappies for overnight if i could use them like this, what do you think???