^ Dem's fightin' words!
I would get rid of the need to sleep, possibly retroactively. This would get rid of all senses of fatigue and weakness especialy in the late hours, save for if you're malnurished. About one third of your life is spent doing absolutely nothing, imagine where we'd be now if suddenly all the great minds in Earth's history got a 50% boost to the time in their days to observe the world more, ponder the workings of the world, and work on their projects.