I'm ambivalent about this. I have a friend whose a Harvard math major, I've seen him work. He sleeps late and wakes early; when we work together, he always messes up my schedule by calling me in the middle of the night. I'm all tired and groggy the next day, and he's totally fine.
I think some people just inherently have more energy than others.
I think some people just inherently have more energy than others.