Early to bed, early to rise.
It takes discipline to complete everything that needs to be done in a day. It takes discipline to work well and rest well. We should rest so that we can be at our best when our best is needed. Being a grownup means making grownup decisions. Our parents gave us a bed time because they knew we needed our rest and we would likely not choose a proper bed time on our own. Then when we grow up, we prove them correct because we claim that we are not morning people. Guess what…no one is a morning person when they stay up to a time that would make it impossible to wake up in the morning having not slept eight consecutive hours. Our parents knew better because they realized that the true discipline isn’t getting up early, but getting to bed on time.