Yup, because now, when he comes back to it he will have a sense of a fresh start as opposed to coming back with the frustration of still having to deal with it. It helps to keep the interest up and the frustration down.
Yep, I hate when I can't get past a certain point in a job...come back next day doing the same thing sucks. Once I get rolling on a job I don't like to stop. I'm like, 'gonna get this part done if it kills me'. That little bit of sleep you miss is nothing compared to the feeling of accomplishment. When you go back to work on it again, it's like " that's right, I kicked your a$$ last time. What's next?" lol