Being tired isn’t a badge of honor
Jason Fried

We all live in a world with 168 hours in a week. Subtract the base 40 work hours plus 8*7=52 sleep hours and you have 76 “uncommitted” hours to tend to everything else like eating, chores, socialising, and relaxing; that’s about 8 hours a day average.

Having built several companies with 2 public exits, I think working hard and long it exactly what you do. And if you can’t get it done with some of those 76 uncommitted hours and choose to sacrifice your sleep hours, then shame on you.