Today, I declared sleep the most important thing in the world. I thought about going to my first class of the day; then decided that it was better to sleep in an extra hour and a half, so that I don't have to take a nap after classes today. Have a big rough draft to kick out tonight for my Revolutionary War class (Second Amendment).
One thing that I have noticed is that in order to write, I need enough sleep. I am not sure if this is true of other writers, but it is true for me. I rack it up to the fact that the "muscle" a writer uses is their brain. If it is not working, then either is the writing. Given the fact that the brain needs sleep to function properly, sometimes sleep is the most important thing in the world for a writer.