Night time creativity

I have discovered that both the kids and I are very creative late at night. Often it can be so annoying to be the mom that is supposed to be grown up and disturbing the kids in some creative exploration. It doesnt matter if I try to begin the night earlier, it isnt before they are at a certain point of tired they get creative. Just like me, sitting here at night writing. And I am clinging to what Duolingo tells me when they say in the app that the best time to learn a new language is right before bedtime. So. I have Duolingo on my side when I sit fascinated and watch the kids create comics in bed with a flash light and thousands of ideas. Also after waking up, before breakfast, they can show some real impressive creativity. I think it has something to do with which type of brain waves are more active in this kind of tired state that can be compared to a meditative state. Is it alpha maybe? I will clear that up another day. Now it is well past my time for bed, I "just had to" :p