Wait, so you're solving the problem of kids not sleeping or not talking? It's not about what the kids could do here, it's about why you want to introduce it to begin with. Which is prayer. The fact that you get an option to not engage in it doesn't make it any different.
I think it does make a difference.
But you make an interesting point (that it allows the introduction of prayer where there was no option for it before). One I will have to think on.