[pauldickwin]

Except that Bill Gates and people of that type don't get tired from it. They get energized.

[dpbriggs]

They aren't super heroes - they need rest as well.

Reading some books you're interested may count as not taking a day off, but it's still restful compared to office work.

[geocar]

When programmers get tired, some take a break, but others write more code than they need to because they can no longer think clearly.

You're right that Bill writes code like that, but I don't think this is something young programmers should envy or idealise.