I need 8 hours of sleep a night. I know some people need a little more, and some people can get by with a little less, but I'm right at the peak of the bell curve.
I usually don't get 8 hours of sleep. I usually get 6 or 7. And revenge sleep procrastination is the reason. I used to think the "revenge" in this scenario is me, getting revenge on the world, but it's really my brain getting revenge on me for mistreating it.
When I work for 8 hours, as I do every weekday, I come home in a state of acute psychic distress. My brain's been prevented from doing anything that it wants to do, anything that would be good for it, all day long. Instead of learning things, being creative, doing things that would contribute to my happiness and well being, it's trapped in a cycle of endless drudgery and tedium.