Huge. When I'm sleepy my error rate can go up by as much as 300%. It's terrifying to think of what that means in terms of how it must be impacting by work when

Huge. When I'm sleepy my error rate can go up by as much as 300%. It's terrifying to think of what that means in terms of how it must be impacting by work when I see that happen. I often study in the morning before work, and if I can see I'm not performing well, I know to do yoga/exercise/etc before I try to do any productive work. (I found that my study outcomes were nearly always better after exercise, if I started badly)