You will eliminate boredom during down-time.
Have you ever found yourself stuck in a waiting room, bored out of your mind, with nothing to read but gossip magazines? If so, you should know that it is wise to keep a book in your purse or car at all times, as you never know when you’ll find yourself with some time to kill. Even if you just take a few minutes to read a chapter during your commute and lunch break every day, those minutes will quickly turn into hours if repeated consistently.
source: Lifehack.org. Read the entire article by Daniel Warren.