Mine go to bed about 9 and I get up at 5:30.
They all have to go by then.
When they were little as yours, I would get up between 1 - 2 Am and let them go potty outside.
Of course I waited till their done and let them in.
Those are tiring nights.
Remember the younger they are the smaller the bladder.
They have to make more trips to the potty than an older dog.