It's important to note that this paper was published over 25 years ago, the field of A.I. was smaller then. I've read this paper multiple times, and I don't think I ever got the sense that you would need to not sleep to do it all. They spend some time talking about how to determine which are the important things to do, which you can let slide (for instance, on page 3 they say "There’s a whole bunch of journals about AI, and you could spend all your time reading them. Fortunately, only a few are worth looking at." then go on to talk about which ones to look at).