How would you like to improve your productivity at work? There is one sure-fire way to do it: Get more rest at night.
It is impossible to be creative, efficient, or effective when you are tired. Fatigue makes it hard to concentrate; it reduces performance; it shortens our frustration fuse. It makes us a less functional, less productive worker than we would be otherwise.
One of the big problems employers face is called presenteeism, not absenteeism. People actually show up for work, but they are not present mentally because they are so tired.
If you want to get ahead at work, get more sleep at night. It's hard to hang out with the night owls and soar like an eagle the next morning.