Sleep. Medina's rule #7 is, Sleep well, think well. First, it's probably a good idea to know what kind of person you are. There are morning people, night owl's and some in between. Identifying when you are at your best because of when you sleep is essential in being your best. I do some of my best work in the morning. It’s also wen I exerciseFor some of you, that idea is appalling! It's okay. Just know when you're at your best (most awake, clear, bright, whatever) and revolve your schedule around it. Of course, how much sleep we get is the key here.