Anonymous wrote:
I have a few era effective app for this. It is called Me. You set a timer and carry it with you. Or you can even use the on on a microwave. When the timer goes off, you take the iPad away. Works every time.

The only time our kids play ipad is when they wake up early on weekends so that we can sleep in till 8, so your "app" would defy the entire point of letting have ipad time.
I'm posted above and I get it. I'm a single parent and I have my kid 24/7/365. It sounds like there are 2 parents in your household so alternate sleeping in. If you both want to sleep in, let them play with the iPads until you wake up. They won't self destruct if they play for an hour or two.