It is in, in fact, making yourself more productive. One has to have rest. Not just sleeping, but with a total awareness one has to relax the body and mind. That comes from the practice of meditation. You've got to sit quietly for a few minutes to calm yourself and relieve your tension, worries, fears, so that your mind becomes stronger.
Many people sit in meditation at home.
Work very hard for 59 minutes, then take a one-minute break, and totally focus your mind on your breathing. Don't think about the future, don't think about anything during that one minute. Just keep your mind totally free from all these things. When that minute is over, you have some additional clarity in your mind, strength to continue on the other 59 minutes. You are less nevous ,less tense toward the end of the day.