I do drink coffee but have no problem sleeping when I'm tired and, over 35 years of engineering have learned to tell when I'm "sharp". There are plenty of task

I do drink coffee but have no problem sleeping when I'm tired and, over 35 years of engineering have learned to tell when I'm "sharp". There are plenty of tasks you can take on when you're a little tired too. I don't sleep as long as many people because I have a bad back bit I'd trade that tiny "competitive advantage in a heartbeat. Other than caffeine I don't take drugs and mostly don't drink alcohol either.