Lot of famous people are like that. Churchill tended to work late into the night. Stalin worked in the early morning hours, lots of low level officials died early from having to work all day and still be awake for a 3am Stalin phone call. A lot just sat there chain smoking waiting for the call, if they did not answer, good chance it was off to the Gulag.
Churchill I don’t mind, he was a political thinker ahead of his time. Even if he did have to make deals with the devil (Stalin) to keep Russia in the war.
Stalin?? Well, bad with the good I guess. Old Josef did send a few hundred low rankers to the prison from which few returned. Fitting that he died of a heart attack because no one wanted to wake him.